From 8a681b1d840e701e41892f8375a15baf56107ab5 Mon Sep 17 00:00:00 2001 From: Peter Stuge Date: Thu, 22 Jan 2009 22:53:59 +0000 Subject: flashrom: Provide some hints for the user in case /dev/mem mmap fails. resolves #121 Signed-off-by: Peter Stuge Acked-by: Carl-Daniel Hailfinger git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3889 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1 --- util/flashrom/flashrom.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'util') diff --git a/util/flashrom/flashrom.c b/util/flashrom/flashrom.c index f613f8a071..7e52fbc8dc 100644 --- a/util/flashrom/flashrom.c +++ b/util/flashrom/flashrom.c @@ -139,6 +139,13 @@ 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"); + } exit(1); } flash->virtual_memory = bios; -- cgit v1.2.3