flashrom: Provide some hints for the user in case /dev/mem mmap fails.
resolves #121 Signed-off-by: Peter Stuge <peter@stuge.se> Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3889 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
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@ -139,6 +139,13 @@ struct flashchip *probe_flash(struct flashchip *first_flash, int force)
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fd_mem, (off_t) base);
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if (bios == MAP_FAILED) {
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perror("Can't mmap memory using " MEM_DEV);
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if (EINVAL == errno) {
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fprintf(stderr, "In Linux this error can be caused by the CONFIG_NONPROMISC_DEVMEM (<2.6.27),\n");
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fprintf(stderr, "CONFIG_STRICT_DEVMEM (>=2.6.27) and CONFIG_X86_PAT kernel options.\n");
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fprintf(stderr, "Please check if either is enabled in your kernel before reporting a failure.\n");
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fprintf(stderr, "You can override CONFIG_X86_PAT at boot with the nopat kernel parameter but\n");
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fprintf(stderr, "disabling the other option unfortunately requires a kernel recompile. Sorry!\n");
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}
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exit(1);
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}
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flash->virtual_memory = bios;
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