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Check all mmap() calls and print helpful Linux error message

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Corresponding to flashrom svn r386 and coreboot v2 svn r3890.

Signed-off-by: Peter Stuge <peter@stuge.se>
Acked-by: Peter Stuge <peter@stuge.se>
This commit is contained in:
Peter Stuge
2009-01-23 05:23:06 +00:00
parent 72c9668b95
commit ccf8c6c794
4 changed files with 19 additions and 7 deletions
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20
flashrom.c
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@ -84,6 +84,17 @@ struct pci_dev *pci_card_find(uint16_t vendor, uint16_t device,
return NULL;
}
void mmap_errmsg()
{
if (EINVAL == errno) {
fprintf(stderr, "In Linux this error can be caused by the CONFIG_NONPROMISC_DEVMEM (<2.6.27),\n");
fprintf(stderr, "CONFIG_STRICT_DEVMEM (>=2.6.27) and CONFIG_X86_PAT kernel options.\n");
fprintf(stderr, "Please check if either is enabled in your kernel before reporting a failure.\n");
fprintf(stderr, "You can override CONFIG_X86_PAT at boot with the nopat kernel parameter but\n");
fprintf(stderr, "disabling the other option unfortunately requires a kernel recompile. Sorry!\n");
}
}
int map_flash_registers(struct flashchip *flash)
{
volatile uint8_t *registers;
@ -94,6 +105,7 @@ int map_flash_registers(struct flashchip *flash)
if (registers == MAP_FAILED) {
perror("Can't mmap registers using " MEM_DEV);
mmap_errmsg();
exit(1);
}
flash->virtual_registers = registers;
@ -139,13 +151,7 @@ struct flashchip *probe_flash(struct flashchip *first_flash, int force)
fd_mem, (off_t) base);
if (bios == MAP_FAILED) {
perror("Can't mmap memory using " MEM_DEV);
if (EINVAL == errno) {
fprintf(stderr, "In Linux this error can be caused by the CONFIG_NONPROMISC_DEVMEM (<2.6.27),\n");
fprintf(stderr, "CONFIG_STRICT_DEVMEM (>=2.6.27) and CONFIG_X86_PAT kernel options.\n");
fprintf(stderr, "Please check if either is enabled in your kernel before reporting a failure.\n");
fprintf(stderr, "You can override CONFIG_X86_PAT at boot with the nopat kernel parameter but\n");
fprintf(stderr, "disabling the other option unfortunately requires a kernel recompile. Sorry!\n");
}
mmap_errmsg();
exit(1);
}
flash->virtual_memory = bios;