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flashrom: Force read unknown flash chips 

When flash chip detection fails, it is still useful and possible to read the
flash chip contents. If no flash chip is found in normal probes and the
-f -r -c CHIPNAME options are given, a successful probe for the specified
chip is forced, and then flashrom reads the flash chip using either the read
function for the specified chip, or if there is none, a simple memcpy().

The patch also moves the global variable int force in flashrom.c into main()
and passes it as a parameter to layout.c:show_id(), which was the only other
function that used the variable. This is needed to avoid confusion with the
new parameter int force which is added to flashrom.c:probe_flash() and used
to force probe success for the chip named in char *chip_to_probe.

Signed-off-by: Peter Stuge <peter@stuge.se>
Acked-by: Ward Vandewege <ward@gnu.org>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3367 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Peter Stuge 2008-06-18 02:08:40 +00:00
parent 01441bd5cf
commit 646eb245e6
3 changed files with 47 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
util/flashrom/flash.h
View File

@ -394,7 +394,7 @@ extern int verbose;
int map_flash_registers(struct flashchip *flash);
/* layout.c */
int show_id(uint8_t *bios, int size);
int show_id(uint8_t *bios, int size, int force);
int read_romlayout(char *name);
int find_romentry(char *name);
int handle_romentries(uint8_t *buffer, uint8_t *content);

51
util/flashrom/flashrom.c
View File

@ -43,7 +43,7 @@
char *chip_to_probe = NULL;
struct pci_access *pacc; /* For board and chipset_enable */
int exclude_start_page, exclude_end_page;
int force = 0, verbose = 0;
int verbose = 0;
int fd_mem;
struct pci_dev *pci_dev_find(uint16_t vendor, uint16_t device)
@ -99,7 +99,7 @@ int map_flash_registers(struct flashchip *flash)
return 0;
}
struct flashchip *probe_flash(struct flashchip *flash)
struct flashchip *probe_flash(struct flashchip *flash, int force)
{
volatile uint8_t *bios;
unsigned long flash_baseaddr, size;
@ -111,7 +111,7 @@ struct flashchip *probe_flash(struct flashchip *flash)
}
printf_debug("Probing for %s %s, %d KB: ",
flash->vendor, flash->name, flash->total_size);
if (!flash->probe) {
if (!flash->probe && !force) {
printf_debug("failed! flashrom has no probe function for this flash chip.\n");
flash++;
continue;
@ -150,7 +150,7 @@ struct flashchip *probe_flash(struct flashchip *flash)
}
flash->virtual_memory = bios;
if (flash->probe(flash) == 1) {
if (force || flash->probe(flash) == 1) {
printf("Found chip \"%s %s\" (%d KB) at physical address 0x%lx.\n",
flash->vendor, flash->name, flash->total_size,
flash_baseaddr);
@ -251,6 +251,7 @@ int main(int argc, char *argv[])
struct flashchip *flash, *flashes[3];
int opt;
int option_index = 0;
int force = 0;
int read_it = 0, write_it = 0, erase_it = 0, verify_it = 0;
int ret = 0, i;
#ifdef __FreeBSD__
@ -413,7 +414,7 @@ int main(int argc, char *argv[])
board_flash_enable(lb_vendor, lb_part);
for (i = 0; i < ARRAY_SIZE(flashes); i++) {
flashes[i] = probe_flash(i ? flashes[i - 1] + 1 : flashchips);
flashes[i] = probe_flash(i ? flashes[i - 1] + 1 : flashchips, 0);
if (!flashes[i])
for (i++; i < ARRAY_SIZE(flashes); i++)
flashes[i] = NULL;
@ -427,6 +428,44 @@ int main(int argc, char *argv[])
exit(1);
} else if (!flashes[0]) {
printf("No EEPROM/flash device found.\n");
if (!force || !chip_to_probe) {
printf("If you know which flash chip you have, and if this version of flashrom\n");
printf("supports a similar flash chip, you can try to force read your chip. Run:\n");
printf("flashrom -f -r -c similar_supported_flash_chip filename\n");
printf("\n");
printf("Note: flashrom can never write when the flash chip isn't found automatically.\n");
}
if (force && read_it && chip_to_probe) {
printf("Force read (-f -r -c) requested, forcing chip probe success:\n");
flashes[0] = probe_flash(flashchips, 1);
if (!flashes[0]) {
printf("flashrom does not support a flash chip named '%s'.\n", chip_to_probe);
printf("Run flashrom -L to view the hardware supported in this flashrom version.\n");
exit(1);
}
size = flashes[0]->total_size * 1024;
buf = (uint8_t *) calloc(size, sizeof(char));
if ((image = fopen(filename, "w")) == NULL) {
perror(filename);
exit(1);
}
printf("Force reading flash...");
if (!flashes[0]->read)
memcpy(buf, (const char *)flashes[0]->virtual_memory, size);
else
flashes[0]->read(flashes[0], buf);
if (exclude_end_position - exclude_start_position > 0)
memset(buf + exclude_start_position, 0,
exclude_end_position - exclude_start_position);
fwrite(buf, sizeof(char), size, image);
fclose(image);
printf("done\n");
free(buf);
exit(0);
}
// FIXME: flash writes stay enabled!
exit(1);
}
@ -522,7 +561,7 @@ int main(int argc, char *argv[])
}
fread(buf, sizeof(char), size, image);
show_id(buf, size);
show_id(buf, size, force);
fclose(image);
}

4
util/flashrom/layout.c
View File

@ -28,8 +28,6 @@ char *mainboard_vendor = NULL;
char *mainboard_part = NULL;
int romimages = 0;
extern int force;
#define MAX_ROMLAYOUT 16
typedef struct {
@ -43,7 +41,7 @@ romlayout_t rom_entries[MAX_ROMLAYOUT];
static char *def_name = "DEFAULT";
int show_id(uint8_t *bios, int size)
int show_id(uint8_t *bios, int size, int force)
{
unsigned int *walk;