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[LinuxBIOS] flashrom support for AMD Geode CS5536 

Attached is a patch that enables AMD Geode CS5536 chipset support.  I
have tested it successfully on a MSM800 board from digital logic.

Signed-off-by: Lane Brooks <lbrooks@mit.edu>
Acked-by: Jordan Crouse <jordan.crouse@amd.com>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2967 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Lane Brooks 2007-11-13 16:45:22 +00:00 committed by Jordan Crouse
parent 8b942e75d2
commit 9fe02e8c65
1 changed files with 55 additions and 0 deletions
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55
util/flashrom/chipset_enable.c
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@ -23,9 +23,15 @@
* Contains the chipset specific flash enables.
*/
#define _LARGEFILE64_SOURCE
#include <stdio.h>
#include <pci/pci.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "flash.h"
static int enable_flash_ali_m1533(struct pci_dev *dev, char *name)
@ -218,6 +224,54 @@ static int enable_flash_cs5530(struct pci_dev *dev, char *name)
return 0;
}
static int enable_flash_cs5536(struct pci_dev *dev, char *name)
{
int fd_msr;
unsigned char buf[8];
unsigned int addr = 0x1808;
/* Geode systems write protect the BIOS via RCONFs (cache
* settings similar to MTRRs). To unlock, change MSR 0x1808
* top byte to 0x22. Reading and writing to msr, however
* requires instrucitons rdmsr/wrmsr, which are ring0 privileged
* instructions so only the kernel can do the read/write. This
* function, therefore, requires that the msr kernel module be
* loaded to access these instructions from user space using
* device /dev/cpu/0/msr. This hard-coded driver location
* could have potential problems on SMP machines since it
* assumes cpu0, but it is safe on the geode which is not SMP.
*
* This is probably not portable beyond linux.
*/
fd_msr = open("/dev/cpu/0/msr", O_RDONLY);
if (!fd_msr) {
perror("open msr");
return -1;
}
lseek64(fd_msr, (off64_t) addr, SEEK_SET);
read(fd_msr, buf, 8);
close(fd_msr);
if (buf[7] != 0x22) {
printf("Enabling Geode MSR to write to flash.\n");
buf[7] = 0x22;
fd_msr = open("/dev/cpu/0/msr", O_WRONLY);
if (!fd_msr) {
perror("open msr");
return -1;
}
lseek64(fd_msr, (off64_t) addr, SEEK_SET);
if (write(fd_msr, buf, 8) < 0) {
perror("msr write");
printf
("Cannot write to MSR. Make sure msr kernel is loaded: 'modprobe msr'\n");
return -1;
}
close(fd_msr);
}
return 0;
}
static int enable_flash_sc1100(struct pci_dev *dev, char *name)
{
uint8_t new;
@ -460,6 +514,7 @@ static FLASH_ENABLE enables[] = {
{0x1078, 0x0100, "CS5530/CS5530A", enable_flash_cs5530},
{0x100b, 0x0510, "SC1100", enable_flash_sc1100},
{0x1039, 0x0008, "SIS5595", enable_flash_sis5595},
{0x1022, 0x2080, "AMD GEODE CS5536", enable_flash_cs5536},
{0x1022, 0x7468, "AMD8111", enable_flash_amd8111},
{0x10B9, 0x1533, "ALi M1533", enable_flash_ali_m1533},
/* this fallthrough looks broken. */