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bios/sdram: add BIOS command for reading SPD

This commit is contained in:
Jędrzej Boczar 2020-05-21 14:09:46 +02:00
parent 8fd3e74ec9
commit a42dc97401
1 changed files with 53 additions and 0 deletions
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53
litex/soc/software/bios/cmds/cmd_litedram.c
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@ -221,3 +221,56 @@ define_command(sdrlevel, sdrlevel, "Perform read/write leveling", LITEDRAM_CMDS)
#ifdef CSR_SDRAM_BASE
define_command(memtest, memtest, "Run a memory test", LITEDRAM_CMDS);
#endif
/**
* Command "spdread"
*
* Read contents of SPD EEPROM memory.
* SPD address is defined by the pins A0, A1, A2.
*
*/
#ifdef CSR_I2C_BASE
static void spdread_handler(int nb_params, char **params)
{
unsigned char buf[256];
unsigned int spdaddr;
int length = sizeof(buf);
char *c;
if (nb_params < 1) {
printf("spdread <spdaddr> [<length>]");
return;
}
spdaddr = strtoul(params[0], &c, 0);
if (*c != 0) {
printf("Incorrect address");
return;
}
if (spdaddr > 0b111) {
printf("SPD EEPROM max address is 0b111 (defined by A0, A1, A2 pins)");
return;
}
if (nb_params > 1) {
length = strtoul(params[1], &c, 0);
if (*c != 0) {
printf("Incorrect address");
return;
}
if (length > sizeof(buf)) {
printf("Max length is %d", sizeof(buf));
return;
}
}
if (!spdread(spdaddr, 0, buf, length)) {
printf("Error when reading SPD EEPROM");
return;
}
dump_bytes((unsigned int *) buf, length, 0);
}
define_command(spdread, spdread_handler, "Read SPD EEPROM", LITEDRAM_CMDS);
#endif