openwrt/flashrom
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Fixes

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- switch to volatile everywhere
 - use myusec_delay instead of usleep

Corresponding to coreboot v1 svn r492.
This commit is contained in:
Ronald G. Minnich
2002-01-29 20:18:02 +00:00
parent f4cf2baec9
commit ef5779d1dd
8 changed files with 137 additions and 88 deletions
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61
flash_rom.c
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@ -109,7 +109,7 @@ int enable_flash_sis630 (void)
struct flashchip * probe_flash(struct flashchip * flash)
{
int fd_mem;
char * bios;
volatile char * bios;
unsigned long size;
if ((fd_mem = open("/dev/mem", O_RDWR)) < 0) {
@ -118,6 +118,7 @@ struct flashchip * probe_flash(struct flashchip * flash)
}
while (flash->name != NULL) {
printf("Trying %s, %d KB\n", flash->name, flash->total_size);
size = flash->total_size * 1024;
bios = mmap (0, size, PROT_WRITE | PROT_READ, MAP_SHARED,
fd_mem, (off_t) (0 - size));
@ -132,7 +133,7 @@ struct flashchip * probe_flash(struct flashchip * flash)
flash->name, (0 - size), bios);
return flash;
}
munmap (bios, size);
munmap ((void *) bios, size);
flash++;
}
return NULL;
@ -142,7 +143,7 @@ int verify_flash (struct flashchip * flash, char * buf)
{
int i = 0;
int total_size = flash->total_size *1024;
char * bios = flash->virt_addr;
volatile char * bios = flash->virt_addr;
printf("Verifying address: ");
while (i++ < total_size) {
@ -156,6 +157,52 @@ int verify_flash (struct flashchip * flash, char * buf)
return 1;
}
// count to a billion. Time it. If it's < 1 sec, count to 10B, etc.
unsigned long micro = 0;
void
myusec_calibrate_delay()
{
unsigned long count = 2 * 1024 * 1024;
volatile unsigned long i;
unsigned long timeusec;
struct timeval start, end;
int ok = 0;
fprintf(stderr, "Setting up microsecond timing loop\n");
while (! ok) {
fprintf(stderr, "Try %d\n", count);
gettimeofday(&start, 0);
for( i = count; i; i--)
;
gettimeofday(&end, 0);
timeusec = 1000000 * (end.tv_sec - start.tv_sec ) +
(end.tv_usec - start.tv_usec);
fprintf(stderr, "timeusec is %d\n", timeusec);
count *= 10;
if (timeusec < 1000000)
continue;
ok = 1;
}
// compute one microsecond. That will be count / time
micro = count / timeusec;
fprintf(stderr, "one us is %d count\n", micro);
}
void
myusec_delay(time)
{
volatile unsigned long i;
for(i = 0; i < time * micro; i++)
;
}
main (int argc, char * argv[])
{
char * buf;
@ -163,20 +210,20 @@ main (int argc, char * argv[])
FILE * image;
struct flashchip * flash;
myusec_calibrate_delay();
if (argc > 2){
printf("usage: %s [romimage]\n", argv[0]);
printf(" If no romimage is specified, then all that happens\n");
printf(" is that flash writes are enabled (useful for DoC)\n");
exit(1);
printf(" is that flash info is dumped\n");
}
enable_flash_sis630 ();
if ((flash = probe_flash (flashchips)) == NULL) {
printf("EEPROM not found\n");
exit(1);
}
printf("Part is %s\n", flash->name);
if (argc < 2){
printf("OK, only ENABLING flash write, but NOT FLASHING\n");
exit(0);