From 72c9668b9535bfe40d3e321faa26cfe5bb9a44b3 Mon Sep 17 00:00:00 2001 From: Peter Stuge Date: Thu, 22 Jan 2009 22:53:59 +0000 Subject: Provide some hints for the user in case /dev/mem mmap fails Resolves #121 Corresponding to flashrom svn r385 and coreboot v2 svn r3889. Signed-off-by: Peter Stuge Acked-by: Carl-Daniel Hailfinger --- flashrom.c | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'flashrom.c') diff --git a/flashrom.c b/flashrom.c index f613f8a..7e52fbc 100644 --- a/flashrom.c +++ b/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 v1.1