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159 commits

Author SHA1 Message Date
Jason Lowe-Power
29dd04cfe9 tests: Add tests for the Learning gem5 scripts
These tests will ensure that Learning gem5 scripts are always up to date with
the changes in the mainline of gem5.

Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2015-09-16 09:35:36 -05:00
Andreas Sandberg
a3f49f60c7 mem: Move trace functionality from the CommMonitor to a probe
This changeset moves the access trace functionality from the
CommMonitor into a separate probe. The probe can be hooked up to any
component that exports probe points of the type ProbePoints::Packet.

This patch moves the dependency on Google's Protocol Buffers library
from the CommMonitor to the MemTraceProbe, which means that the
CommMonitor (including stack distance profiling) no long depends on
it.
2015-08-04 10:29:13 +01:00
Andreas Sandberg
022e69e6de mem: Redesign the stack distance calculator as a probe
This changeset removes the stack distance calculator hooks from the
CommMonitor class and implements a stack distance calculator as a
memory system probe instead. The probe can be hooked up to any
component that exports probe points of the type ProbePoints::Packet.
2015-08-04 10:29:13 +01:00
Andreas Sandberg
decd6b958e tests: Add Minor to the ARM full switcheroo tests
Add the Minor CPU to the RealView and RealView64 full switcheroo
tests.
2015-07-30 10:16:28 +01:00
Andreas Sandberg
f16c0a4a90 sim: Decouple draining from the SimObject hierarchy
Draining is currently done by traversing the SimObject graph and
calling drain()/drainResume() on the SimObjects. This is not ideal
when non-SimObjects (e.g., ports) need draining since this means that
SimObjects owning those objects need to be aware of this.

This changeset moves the responsibility for finding objects that need
draining from SimObjects and the Python-side of the simulator to the
DrainManager. The DrainManager now maintains a set of all objects that
need draining. To reduce the overhead in classes owning non-SimObjects
that need draining, objects inheriting from Drainable now
automatically register with the DrainManager. If such an object is
destroyed, it is automatically unregistered. This means that drain()
and drainResume() should never be called directly on a Drainable
object.

While implementing the new functionality, the DrainManager has now
been made thread safe. In practice, this means that it takes a lock
whenever it manipulates the set of Drainable objects since SimObjects
in different threads may create Drainable objects
dynamically. Similarly, the drain counter is now an atomic_uint, which
ensures that it is manipulated correctly when objects signal that they
are done draining.

A nice side effect of these changes is that it makes the drain state
changes stricter, which the simulation scripts can exploit to avoid
redundant drains.
2015-07-07 09:51:05 +01:00
Andreas Sandberg
d7a56ee524 tests: Skip SPARC tests if the required binaries are missing
The full-system SPARC tests depend on several binaries that aren't
generally available to the wider community. Flag the tests as skipped
instead of failed if these binaries can't be found.
2015-07-07 09:51:03 +01:00
Andreas Hansson
893533a126 mem: Allow read-only caches and check compliance
This patch adds a parameter to the BaseCache to enable a read-only
cache, for example for the instruction cache, or table-walker cache
(not for x86). A number of checks are put in place in the code to
ensure a read-only cache does not end up with dirty data.

A follow-on patch adds suitable read requests to allow a read-only
cache to explicitly ask for clean data.
2015-07-03 10:14:39 -04:00
Andreas Sandberg
877435950c test, arm: Add scripts to test checkpoints
Add a set of scripts to automatically test checkpointing in the
regression framework. The checkpointing tests are similar to the
switcheroo tests, but instead of switching between CPUs, they
checkpoint the system and restore from the checkpoint again. This is
done at regular intervals, typically while booting Linux.

The implementation is fairly straight forward, with the exception that
we have to work around gem5's inability to restore from a checkpoint
after a system has been instantiated. We work around this by forking
off child processes that does the actual simulation and never
instantiate a system in the parent process unless a maximum checkpoint
count is reached (in which case we just simulate the system to
completion in the parent).

Checkpoint testing is currently only enabled 32- and 64-bit ARM
systems using atomic CPUs.

Note: An unfortunate side-effect of forking is that every new process
will overwrite the stats and terminal output from the previous
process. This means that the output directory only contains data from
the last checkpoint.
2015-03-19 04:06:20 -04:00
Andreas Hansson
36dc93a5fa mem: Move crossbar default latencies to subclasses
This patch introduces a few subclasses to the CoherentXBar and
NoncoherentXBar to distinguish the different uses in the system. We
use the crossbar in a wide range of places: interfacing cores to the
L2, as a system interconnect, connecting I/O and peripherals,
etc. Needless to say, these crossbars have very different performance,
and the clock frequency alone is not enough to distinguish these
scenarios.

Instead of trying to capture every possible case, this patch
introduces dedicated subclasses for the three primary use-cases:
L2XBar, SystemXBar and IOXbar. More can be added if needed, and the
defaults can be overridden.
2015-03-02 04:00:47 -05:00
Andreas Hansson
6563ec8634 cpu: Tidy up the MemTest and make false sharing more obvious
The MemTest class really only tests false sharing, and as such there
was a lot of old cruft that could be removed. This patch cleans up the
tester, and also makes it more clear what the assumptions are. As part
of this simplification the reference functional memory is also
removed.

The regression configs using MemTest are updated to reflect the
changes, and the stats will be bumped in a separate patch. The example
config will be updated in a separate patch due to more extensive
re-work.

In a follow-on patch a new tester will be introduced that uses the
MemChecker to implement true sharing.
2015-02-11 10:23:28 -05:00
Andreas Hansson
de162ad968 tests: Remove deprecated InOrderCPU tests
This patch removes the three MIPS and SPARC regressions that use the
deprecated InOrderCPU.

This is the first step in completely removing the code from the tree,
avoiding confusion, and focusing all development efforts on the
MinorCPU. Brave new world.
2015-01-20 08:12:02 -05:00
Andreas Hansson
e76e8e28a3 tests: Add a regression for the stack distance calculator
Re-use the existing traffic generator regression, and enable the stack
distance calculation in the comm monitor, along with the verification
stack.

The traffic generator config is also tuned to not increase the
run-time too much (and actually have some address re-use).
2014-12-23 09:31:18 -05:00
Nilay Vaish
3022d463fb ruby: interface with classic memory controller
This patch is the final in the series.  The whole series and this patch in
particular were written with the aim of interfacing ruby's directory controller
with the memory controller in the classic memory system.  This is being done
since ruby's memory controller has not being kept up to date with the changes
going on in DRAMs.  Classic's memory controller is more up to date and
supports multiple different types of DRAM.  This also brings classic and
ruby ever more close.  The patch also changes ruby's memory controller to
expose the same interface.
2014-11-06 05:42:21 -06:00
Nilay Vaish
95a0b18431 ruby: single physical memory in fs mode
Both ruby and the system used to maintain memory copies.  With the changes
carried for programmed io accesses, only one single memory is required for
fs simulations.  This patch sets the copy of memory that used to reside
with the system to null, so that no space is allocated, but address checks
can still be carried out.  All the memory accesses now source and sink values
to the memory maintained by ruby.
2014-11-06 05:41:44 -06:00
Ali Saidi
f2db2a96d1 arm, tests: Update config files to more recent kernels and create 64-bit regressions.
This changes the default ARM system to a Versatile Express-like system that supports
2GB of memory and PCI devices and updates the default kernels/file-systems for
AArch64 ARM systems (64-bit) to support up to 32GB of memory and PCI devices. Some
platforms that are no longer supported have been pruned from the configuration files.

In addition a set of 64-bit ARM regressions have been added to the regression system.
2014-10-29 23:18:27 -05:00
Andreas Hansson
2b0438a11e tests: Use more representative configs for ARM tests
This patch changes the CPU and cache configurations used in the ARM SE and FS
regressions to make them more representative, and also get better code
coverage by exercising different replacement policies and use an L2
prefetcher.
2014-09-20 17:18:33 -04:00
Andreas Hansson
1f6d5f8f84 mem: Rename Bus to XBar to better reflect its behaviour
This patch changes the name of the Bus classes to XBar to better
reflect the actual timing behaviour. The actual instances in the
config scripts are not renamed, and remain as e.g. iobus or membus.

As part of this renaming, the code has also been clean up slightly,
making use of range-based for loops and tidying up some comments. The
only changes outside the bus/crossbar code is due to the delay
variables in the packet.

--HG--
rename : src/mem/Bus.py => src/mem/XBar.py
rename : src/mem/coherent_bus.cc => src/mem/coherent_xbar.cc
rename : src/mem/coherent_bus.hh => src/mem/coherent_xbar.hh
rename : src/mem/noncoherent_bus.cc => src/mem/noncoherent_xbar.cc
rename : src/mem/noncoherent_bus.hh => src/mem/noncoherent_xbar.hh
rename : src/mem/bus.cc => src/mem/xbar.cc
rename : src/mem/bus.hh => src/mem/xbar.hh
2014-09-20 17:18:32 -04:00
Andreas Hansson
1884bcc03b tests: Add a memtest version using the ideal SnoopFilter
This patch adds a basic regression test for the snoop filter.

--HG--
rename : tests/configs/memtest.py => tests/configs/memtest-filter.py
2014-09-20 17:18:30 -04:00
Andreas Hansson
351e146b37 alpha: Stop using 'inorder' and rely entirely on 'minor'
This patch avoids building the 'inorder' CPU model for any permutation
of ALPHA, and also removes the ALPHA regressions using the 'inorder'
CPU. The 'minor' CPU is already providing a broader test coverage.
2014-09-03 07:42:56 -04:00
Andreas Hansson
ee68c2b302 tests: Use O3_ARM_v7a config for full-system ARM regressions
This patch changes the CPU configuration used for the full-system ARM
regressions to increase the test coverage. Note that it is only the
core configuration, and not the caches etc.
2014-09-03 07:42:41 -04:00
Emilio Castillo ext:(%2C%20Nilay%20Vaish%20%3Cnilay%40cs.wisc.edu%3E)
01f792a367 ruby: Fixes clock domains in configuration files
This patch fixes scripts related to ruby by adding the ruby clock domain.
Now the L1 controllers and  the Sequencer shares the cpu clock domain,
while the rest of the components use the ruby clock domain.

Before this patch, running simulations with the cpu clock set at 2GHz or
1GHz will output the same time results and could distort power measurements.

Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2014-09-01 16:55:30 -05:00
Andrew Bardsley
5d0b25ba3f cpu: Minor CPU add regression tests for ARM and ALPHA
This patch adds regression tests results and test harnesses
for the Minor CPU on ARM and ALPHA.
2014-07-23 16:09:05 -05:00
Andreas Hansson
64806c4c13 tests: Reflect name change in DRAM tests
This patch reflects the recent name change in the DRAM TrafficGen
tests and also tidies up the test directory.

--HG--
rename : tests/configs/tgen-simple-dram.py => tests/configs/tgen-dram-ctrl.py
rename : tests/quick/se/70.tgen/ref/null/none/tgen-simple-dram/config.ini => tests/quick/se/70.tgen/ref/null/none/tgen-dram-ctrl/config.ini
rename : tests/quick/se/70.tgen/ref/null/none/tgen-simple-dram/simerr => tests/quick/se/70.tgen/ref/null/none/tgen-dram-ctrl/simerr
rename : tests/quick/se/70.tgen/ref/null/none/tgen-simple-dram/simout => tests/quick/se/70.tgen/ref/null/none/tgen-dram-ctrl/simout
rename : tests/quick/se/70.tgen/ref/null/none/tgen-simple-dram/stats.txt => tests/quick/se/70.tgen/ref/null/none/tgen-dram-ctrl/stats.txt
rename : tests/quick/se/70.tgen/tgen-simple-dram.cfg => tests/quick/se/70.tgen/tgen-dram-ctrl.cfg
2014-05-09 18:58:49 -04:00
Sascha Bischoff
e940bac278 mem: Auto-generate CommMonitor trace file names
Splits the CommMonitor trace_file parameter into three parameters. Previously,
the trace was only enabled if the trace_file parameter was set, and would be
written to this file. This patch adds in a trace_enable and trace_compress
parameter to the CommMonitor.

No trace is generated if trace_enable is set to False. If it is set to True, the
trace is written to a file based on the name of the SimObject in the simulation
hierarchy. For example, system.cluster.il1_commmonitor.trc. This filename can be
overridden by additionally specifying a file name to the trace_file parameter
(more on this later).

The trace_compress parameter will append .gz to any filename if set to True.
This enables compression of the generated traces. If the file name already ends
in .gz, then no changes are made.

The trace_file parameter will override the name set by the trace_enable
parameter. In the case that the specified name does not end in .gz but
trace_compress is set to true, .gz is appended to the supplied file name.
2014-05-09 18:58:46 -04:00
Nilay Vaish
b5cc4c7604 config: ruby: rename _cpu_ruby_ports to _cpu_ports 2014-03-20 09:14:14 -05:00
Nilay Vaish
d5b5d89b34 config: remove ruby_fs.py
The patch removes the ruby_fs.py file.  The functionality is being moved to
fs.py.  This would being ruby fs simulations in line with how ruby se
simulations are started (using --ruby option).  The alpha fs config functions
are being combined for classing and ruby memory systems.  This required
renaming the piobus in ruby to iobus.  So, we will have stats being renamed
in the stats file for ruby fs regression.
2014-03-20 08:03:09 -05:00
Nilay Vaish
9b3418d163 ruby: no piobus in se mode
Piobus was recently added to se scripts for ruby so that the interrupt
controller can be connected to something (required since the interrupt
controller sends address range messages).  This patch removes the piobus
and instead, the pio port of ruby port will now ignore the range change
messages in se mode.
2014-03-20 08:03:09 -05:00
Nilay Vaish
8504b079b8 ruby: correct errors in changeset 4eec7bdde5b0
Couple of errors were discovered in 4eec7bdde5b0 which necessitated this patch.
Firstly, we create interrupt controllers in the se mode, but no piobus was
being created.  RubyPort, which earlier used to ignore range changes now
forwards those to the piobus.  The lack of piobus resulted in segmentation
fault.  This patch creates a piobus even in se mode.  It is not created only
when some tester is running.  Secondly,  I had missed out on modifying port
connections for other coherence protocols.
2014-02-24 20:50:05 -06:00
Nilay Vaish
7e27860ef4 ruby: route all packets through ruby port
Currently, the interrupt controller in x86 is connected to the io bus
directly.  Therefore the packets between the io devices and the interrupt
controller do not go through ruby.  This patch changes ruby port so that
these packets arrive at the ruby port first, which then routes them to their
destination.  Note that the patch does not make these packets go through the
ruby network.  That would happen in a subsequent patch.
2014-02-23 19:16:16 -06:00
Steve Reinhardt
a212844f67 config, x86: move kernel specification from tests to FSConfig.py
For some reason, the default x86 kernel is specified in
tests/configs/x86_generic.py and not in configs/common/FSConfig.py,
where the kernels for all the other ISAs are.  This means that
running configs/example/fs.py for x86 fails because no kernel
is specified.  Moving the specification over fixes this problem.

There is another problem that this uncovers, which is that going
past the init stage (i.e., past where the regression test stops)
fails because the fsck test on the disk device fails, but that's
a separate issue.
2014-01-03 17:08:44 -08:00
Steve Reinhardt
a2c21d47a8 tests: suppress output on switcheroo tests
The output from the switcheroo tests is voluminous and
(because it includes timestamps) highly sensitive to
minor changes, leading to extremely large updates to the
reference outputs.  This patch addresses this problem
by suppressing output from the tests.  An internal
parameter can be set to enable the output.  Wiring that
up to a command-line flag (perhaps even the rudimantary
-v/-q options in m5/main.py) is left for future work.
2013-11-14 15:03:42 -08:00
Andreas Hansson
9145e2cfd4 test: Use SimpleMemory for atomic full-system tests
Keep it simple and use the SimpleMemory rather than the DRAM
controller model for atomic full-system tests.
2013-11-01 11:56:14 -04:00
Nilay Vaish
c4e7e18eeb ruby: add option for number of transitions per cycle
The number of transitions per cycle that a controller can carry out is
a proxy for the number of ports that a controller has. This value is
currently 32 which is way too high. The patch introduces an option
for the number of ports and uses this option in the protocol files
to set the number of transitions. The default value is being set to
4. None of the se regressions change. Ruby stats for the fs regression
change and are being updated.
2013-08-20 11:32:31 -05:00
Andreas Hansson
49d88f08b0 mem: Change AbstractMemory defaults to match the common case
This patch changes the default parameter value of conf_table_reported
to match the common case. It also simplifies the regression and config
scripts to reflect this change.
2013-08-19 03:52:33 -04:00
Akash Bagdia
e7e17f92db power: Add voltage domains to the clock domains
This patch adds the notion of voltage domains, and groups clock
domains that operate under the same voltage (i.e. power supply) into
domains. Each clock domain is required to be associated with a voltage
domain, and the latter requires the voltage to be explicitly set.

A voltage domain is an independently controllable voltage supply being
provided to section of the design. Thus, if you wish to perform
dynamic voltage scaling on a CPU, its clock domain should be
associated with a separate voltage domain.

The current implementation of the voltage domain does not take into
consideration cases where there are derived voltage domains running at
ratio of native voltage domains, as with the case where there can be
on-chip buck/boost (charge pumps) voltage regulation logic.

The regression and configuration scripts are updated with a generic
voltage domain for the system, and one for the CPUs.
2013-08-19 03:52:28 -04:00
Andreas Hansson
a8480fe1c3 config: Move the memory instantiation outside FSConfig
This patch moves the instantiation of the memory controller outside
FSConfig and instead relies on the mem_ranges to pass the information
to the caller (e.g. fs.py or one of the regression scripts). The main
motivation for this change is to expose the structural composition of
the memory system and allow more tuning and configuration without
adding a large number of options to the makeSystem functions.

The patch updates the relevant example scripts to maintain the current
functionality. As the order that ports are connected to the memory bus
changes (in certain regresisons), some bus stats are shuffled
around. For example, what used to be layer 0 is now layer 1.

Going forward, options will be added to support the addition of
multi-channel memory controllers.
2013-08-19 03:52:27 -04:00
Nilay Vaish
af58313fd6 regressions: update a couple of configs
The configs for pc-simple-timing-ruby, t1000-simple-atomic had not been
updated correctly in the patch 6e6cefc1db1f.
2013-07-02 10:10:58 -05:00
Akash Bagdia
7d7ab73862 sim: Add the notion of clock domains to all ClockedObjects
This patch adds the notion of source- and derived-clock domains to the
ClockedObjects. As such, all clock information is moved to the clock
domain, and the ClockedObjects are grouped into domains.

The clock domains are either source domains, with a specific clock
period, or derived domains that have a parent domain and a divider
(potentially chained). For piece of logic that runs at a derived clock
(a ratio of the clock its parent is running at) the necessary derived
clock domain is created from its corresponding parent clock
domain. For now, the derived clock domain only supports a divider,
thus ensuring a lower speed compared to its parent. Multiplier
functionality implies a PLL logic that has not been modelled yet
(create a separate clock instead).

The clock domains should be used as a mechanism to provide a
controllable clock source that affects clock for every clocked object
lying beneath it. The clock of the domain can (in a future patch) be
controlled by a handler responsible for dynamic frequency scaling of
the respective clock domains.

All the config scripts have been retro-fitted with clock domains. For
the System a default SrcClockDomain is created. For CPUs that run at a
different speed than the system, there is a seperate clock domain
created. This domain incorporates the CPU and the associated
caches. As before, Ruby runs under its own clock domain.

The clock period of all domains are pre-computed, such that no virtual
functions or multiplications are needed when calling
clockPeriod. Instead, the clock period is pre-computed when any
changes occur. For this to be possible, each clock domain tracks its
children.
2013-06-27 05:49:49 -04:00
Andreas Hansson
4de3205afa config: Add a BaseSESystem builder for re-use in regressions
This patch extends the existing system builders to also include a
syscall-emulation builder. This builder is deployed in all
syscall-emulation regressions that do not involve Ruby,
i.e. o3-timing, simple-timing and simple-atomic, as well as the
multi-processor regressions o3-timing-mp, simple-timing-mp and
simple-atomic-mp (the latter are only used by SPARC at this point).

The values chosen for the cache sizes match those that were used in
the existing config scripts (despite being on the large
side). Similarly, a mem_class parameter is added to the builder base
class to enable simple-atomic to use SimpleMemory and o3-timing to use
the default DDR3 configuration.

Due to the different order the ports are connected, the bus stats get
shuffled around for the multi-processor regressions. A separate patch
bumps the port indices. Besides this, all behaviour is exactly the
same.
2013-06-27 05:49:49 -04:00
Akash Bagdia
076d04a653 config: Add a system clock command-line option
This patch adds a 'sys_clock' command-line option and use it to assign
clocks to the system during instantiation.

As part of this change, the default clock in the System class is
removed and whenever a system is instantiated a system clock value
must be set. A default value is provided for the command-line option.

The configs and tests are updated accordingly.
2013-06-27 05:49:49 -04:00
Akash Bagdia
7eccb1b779 config: Remove redundant explicit setting of default clocks
This patch removes the explicit setting of the clock period for
certain instances of CoherentBus, NonCoherentBus and IOCache where the
specified clock is same as the default value of the system clock. As
all the values used are the defaults, there are no performance
changes. There are similar cases where the toL2Bus is set to use the
parent CPU clock which is already the default behaviour.

The main motivation for these simplifications is to ease the
introduction of clock domains.
2013-06-27 05:49:49 -04:00
Andreas Hansson
3bc4ecdcb4 mem: More descriptive DRAM config names
This patch changes the class names of the variuos DRAM configurations
to better reflect what memory they are based on. The speed and
interface width is now part of the name, and also the alias that is
used to select them on the command line.

Some minor changes are done to the actual parameters, to better
reflect the named configurations. As a result of these changes the
regressions change slightly and the stats will be bumped in a separate
patch.
2013-05-30 12:54:14 -04:00
Andreas Hansson
9f8b1aec49 config: Added memory type to t1000 regression
This patch adds the memory type parameter to the t1000 regression.
2013-04-28 17:14:39 -04:00
Nilay Vaish
c2d799c6b0 x86: regressions: add switcher full test 2013-04-23 00:03:09 -05:00
Andreas Hansson
3477d60d5c config: Add a mem-type config option to se/fs scripts
This patch enables selection of the memory controller class through a
mem-type command-line option. Behind the scenes, this option is
treated much like the cpu-type, and a similar framework is used to
resolve the valid options, and translate the short-hand description to
a valid class.

The regression scripts are updated with a hardcoded memory class for
the moment. The best solution going forward is probably to get the
memory out of the makeSystem functions, but Ruby complicates things as
it does not connect the memory controller to the membus.

--HG--
rename : configs/common/CpuConfig.py => configs/common/MemConfig.py
2013-04-22 13:20:33 -04:00
Andreas Sandberg
dc83d23425 tests: Add support for testing KVM-based CPUs
This changeset adds support for initializing a KVM VM in the
BaseSystem test class and adds the following methods in run.py:

require_file -- Test if a file exists and abort/skip if not.
require_kvm -- Test if KVM support has been compiled into gem5 (i.e.,
	       BaseKvmCPU exists) and the KVM device exists on the
	       host.
2013-04-22 13:20:32 -04:00
Andreas Sandberg
5f2361f3af arm: Enable support for triggering a sim panic on kernel panics
Add the options 'panic_on_panic' and 'panic_on_oops' to the
LinuxArmSystem SimObject. When these option are enabled, the simulator
panics when the guest kernel panics or oopses. Enable panic on panic
and panic on oops in ARM-based test cases.
2013-04-22 13:20:31 -04:00
Nilay Vaish
c061819890 ruby: remove the functional copy of memory in se mode
This patch removes the functional copy of the memory that was maintained in
the se mode. Now ruby itself will provide the data.
2013-03-06 21:53:57 -06:00
Andreas Sandberg
e5dca84c3f config: Move CPU handover logic to m5.switchCpus()
CPU switching consists of the following steps:
 1. Drain the system
 2. Switch out old CPUs (cpu.switchOut())
 3. Change the system timing mode to the mode the new CPUs require
 4. Flush caches if switching to hardware virtualization
 5. Inform new CPUs of the handover (cpu.takeOverFrom())
 6. Resume the system

m5.switchCpus() previously only did step 2 & 5. Since information
about the new processors' memory system requirements is now exposed,
do all of the steps above.

This patch adds automatic memory system switching and flush (if
needed) to switchCpus(). Additionally, it adds optional draining to
switchCpus(). This has the following implications:

* changeToTiming and changeToAtomic are no longer needed, so they have
  been removed.

* changeMemoryMode is only used internally, so it is has been renamed
  to be private.

* switchCpus requires a reference to the system containing the CPUs as
  its first parameter.

WARNING: This changeset breaks compatibility with existing
configuration scripts since it changes the signature of
m5.switchCpus().
2013-02-15 17:40:08 -05:00
Andreas Hansson
c4898b15bc mem: Add DDR3 and LPDDR2 DRAM controller configurations
This patch moves the default DRAM parameters from the SimpleDRAM class
to two different subclasses, one for DDR3 and one for LPDDR2. More can
be added as we go forward.

The regressions that previously used the SimpleDRAM are now using
SimpleDDR3 as this is the most similar configuration.
2013-01-31 07:49:14 -05:00