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Provide some hints for the user in case /dev/mem mmap fails

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Resolves #121

Corresponding to flashrom svn r385 and coreboot v2 svn r3889.

Signed-off-by: Peter Stuge <peter@stuge.se>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
This commit is contained in:
Peter Stuge 2009-01-22 22:53:59 +00:00
parent 37179b807c
commit 72c9668b95
1 changed files with 7 additions and 0 deletions
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7
flashrom.c
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@ -139,6 +139,13 @@ struct flashchip *probe_flash(struct flashchip *first_flash, int force)
fd_mem, (off_t) base); fd_mem, (off_t) base);
if (bios == MAP_FAILED) { if (bios == MAP_FAILED) {
perror("Can't mmap memory using " MEM_DEV); 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");
}
exit(1); exit(1);
} }
flash->virtual_memory = bios; flash->virtual_memory = bios;