fdbede5dcf
This program uses the i2c /dev interface to read the contents of EEPROMs and display it to the user in HEX and ASCII. It also has a mode that can display data in label:value pairs. That mode is used for board detection in the rc script to start the right i2c drivers for the board. Change-Id: I0bf5b13ffab5a89533c762d6881a145cf7f14914
88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
#include <minix/i2c.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "eepromread.h"
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/*
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* Attempt to read the board info from an eeprom on this board.
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* Currently only supports the BeagleBone and BeagleBone Black.
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* In the future, this could be expanded to support cape EEPROMs.
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*/
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static int board_info_beaglebone(int fd, i2c_addr_t address);
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/* Memory Layout of the BeagleBone and BeagleBone Black EEPROM */
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typedef struct beaglebone_info
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{
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uint8_t magic_number[4]; /* Should be 0xaa 0x55 0x33 0xee */
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char board_name[8]; /* Warning: strings not NULL terminated */
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char version[4];
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char serial_number[12];
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char config[32]; /* All 0x00 on BeagleBone White */
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char mac_addrs[3][6]; /* Not set on BeagleBone White */
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} beaglebone_info_t;
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static int
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board_info_beaglebone(int fd, i2c_addr_t address)
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{
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int r;
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int i, j;
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char s[33];
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beaglebone_info_t boneinfo;
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r = eeprom_read(fd, address, 0x0000, &boneinfo,
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sizeof(beaglebone_info_t));
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if (r == -1) {
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fprintf(stderr, "Failed to read BeagleBone info r=%d\n", r);
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return -1;
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}
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fprintf(stdout, "%-16s: 0x%x%x%x%x\n", "MAGIC_NUMBER",
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boneinfo.magic_number[0], boneinfo.magic_number[1],
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boneinfo.magic_number[2], boneinfo.magic_number[3]);
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memset(s, '\0', 33);
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memcpy(s, boneinfo.board_name, 8);
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fprintf(stdout, "%-16s: %s\n", "BOARD_NAME", s);
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memset(s, '\0', 33);
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memcpy(s, boneinfo.version, 4);
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fprintf(stdout, "%-16s: %s\n", "VERSION", s);
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memcpy(s, boneinfo.serial_number, 12);
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fprintf(stdout, "%-16s: %s\n", "SERIAL_NUMBER", s);
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return 0;
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}
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int
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board_info(int fd, i2c_addr_t address)
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{
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int r;
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uint8_t magic_number[4];
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r = eeprom_read(fd, address, 0x0000, &magic_number, 4);
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if (r == -1) {
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printf("%-16s: %s\n", "BOARD_NAME", "UNKNOWN");
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return 0;
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}
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if (magic_number[0] == 0xaa && magic_number[1] == 0x55 &&
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magic_number[2] == 0x33 && magic_number[3] == 0xee) {
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board_info_beaglebone(fd, address);
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} else {
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printf("%-16s: %s\n", "BOARD_NAME", "UNKNOWN");
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}
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return 0;
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}
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