From 72c9668b9535bfe40d3e321faa26cfe5bb9a44b3 Mon Sep 17 00:00:00 2001
From: Peter Stuge <peter@stuge.se>
Date: Thu, 22 Jan 2009 22:53:59 +0000
Subject: [PATCH] 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 <peter@stuge.se>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
---
flashrom.c | 7 +++++++
1 file changed, 7 insertions(+)
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;
--
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