Capes (i.e. expansion boards for the BeagleBone and BeagleBone Black) each have their own cat24c256 EEPROM with information about the cape such as the name of the cape, pins used, power requirements, etc. This patch adds support for displaying the cape data fields. It can be used in shell scripts to detect and identify attached capes. Change-Id: I4bfa7aae634a7bacfa5e25afcba773d9fbc2316c
225 lines
5.7 KiB
C
225 lines
5.7 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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*/
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static int board_info_beaglebone(int fd, i2c_addr_t address, int flags);
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static int board_info_cape_a0(int fd, i2c_addr_t address, int flags);
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static int board_info_cape_a1(int fd, i2c_addr_t address, int flags);
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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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/* Memory Layout of the Cape EEPROM (A0 Format) - Defined in BBW SRM Rev A5.3 */
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typedef struct cape_info_a0
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{
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uint8_t magic_number[4]; /* Should be 0xaa 0x55 0x33 0xee */
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char revision[2]; /* Should be 'A' '0' */
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char board_name[32]; /* Warning: strings not NULL terminated */
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char version[4];
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char manufacturer[16];
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char partno[16];
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char num_pins[2];
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char serial[12];
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char pin_usage[140];
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char vdd_3v3exp_i[2];
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char vdd_5v_i[2];
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char sys_5v_i[2];
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char dc_supp[2];
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} cape_info_a0_t;
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/* Memory Layout of the Cape EEPROM (A1 Format) - Defined in BBB SRM Rev A5.3 */
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typedef struct cape_info_a1
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{
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uint8_t magic_number[4]; /* Should be 0xaa 0x55 0x33 0xee */
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char revision[2]; /* Should be 'A' '1' */
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char board_name[32]; /* Warning: strings not NULL terminated */
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char version[4];
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char manufacturer[16];
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char partno[16];
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char num_pins[2];
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char serial[12];
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char pin_usage[148];
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char vdd_3v3exp_i[2];
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char vdd_5v_i[2];
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char sys_5v_i[2];
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char dc_supp[2];
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} cape_info_a1_t;
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static int
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board_info_beaglebone(int fd, i2c_addr_t address, int flags)
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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), flags);
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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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memset(s, '\0', 33);
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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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static int
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board_info_cape_a0(int fd, i2c_addr_t address, int flags)
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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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cape_info_a0_t capeinfo;
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r = eeprom_read(fd, address, 0x0000, &capeinfo,
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sizeof(cape_info_a0_t), flags);
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if (r == -1) {
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fprintf(stderr, "failed to read cape A0 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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capeinfo.magic_number[0], capeinfo.magic_number[1],
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capeinfo.magic_number[2], capeinfo.magic_number[3]);
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memset(s, '\0', 33);
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memcpy(s, capeinfo.revision, 2);
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fprintf(stdout, "%-16s: %s\n", "REVISION", s);
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memset(s, '\0', 33);
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memcpy(s, capeinfo.board_name, 32);
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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, capeinfo.version, 4);
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fprintf(stdout, "%-16s: %s\n", "VERSION", s);
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memset(s, '\0', 33);
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memcpy(s, capeinfo.manufacturer, 16);
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fprintf(stdout, "%-16s: %s\n", "MANUFACTURER", s);
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memset(s, '\0', 33);
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memcpy(s, capeinfo.partno, 16);
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fprintf(stdout, "%-16s: %s\n", "PART_NUMBER", s);
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memset(s, '\0', 33);
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memcpy(s, capeinfo.serial, 12);
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fprintf(stdout, "%-16s: %s\n", "SERIAL", s);
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return 0;
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}
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static int
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board_info_cape_a1(int fd, i2c_addr_t address, int flags)
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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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cape_info_a1_t capeinfo;
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r = eeprom_read(fd, address, 0x0000, &capeinfo,
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sizeof(cape_info_a1_t), flags);
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if (r == -1) {
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fprintf(stderr, "failed to read cape A0 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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capeinfo.magic_number[0], capeinfo.magic_number[1],
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capeinfo.magic_number[2], capeinfo.magic_number[3]);
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memset(s, '\0', 33);
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memcpy(s, capeinfo.revision, 2);
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fprintf(stdout, "%-16s: %s\n", "REVISION", s);
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memset(s, '\0', 33);
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memcpy(s, capeinfo.board_name, 32);
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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, capeinfo.version, 4);
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fprintf(stdout, "%-16s: %s\n", "VERSION", s);
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memset(s, '\0', 33);
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memcpy(s, capeinfo.manufacturer, 16);
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fprintf(stdout, "%-16s: %s\n", "MANUFACTURER", s);
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memset(s, '\0', 33);
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memcpy(s, capeinfo.partno, 16);
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fprintf(stdout, "%-16s: %s\n", "PART_NUMBER", s);
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memset(s, '\0', 33);
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memcpy(s, capeinfo.serial, 12);
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fprintf(stdout, "%-16s: %s\n", "SERIAL", 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, int flags)
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{
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int r;
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uint8_t magic_number[6];
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r = eeprom_read(fd, address, 0x0000, &magic_number, 6, flags);
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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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/* Check for BeagleBone/BeagleBone Black/Cape Magic Number */
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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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/* Check if Cape Rev A0, Cape Rev A1, or on-board EEPROM */
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if (magic_number[4] == 'A' && magic_number[5] == '0') {
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board_info_cape_a0(fd, address, flags);
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} else if (magic_number[4] == 'A' && magic_number[5] == '1') {
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board_info_cape_a1(fd, address, flags);
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} else {
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board_info_beaglebone(fd, address, flags);
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}
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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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