r3889 - trunk/util/flashrom

Author: stuge
Date: 2009-01-22 23:53:59 +0100 (Thu, 22 Jan 2009)
New Revision: 3889

Modified:
   trunk/util/flashrom/flashrom.c
Log:
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

Modified: trunk/util/flashrom/flashrom.c
===================================================================
--- trunk/util/flashrom/flashrom.c	2009-01-21 01:56:53 UTC (rev 3888)
+++ trunk/util/flashrom/flashrom.c	2009-01-22 22:53:59 UTC (rev 3889)
@@ -139,6 +139,13 @@
    		    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;