POST: limit memory test area to not touch global data anymore

As experienced on lwmon5, on some boards the POST memory test can
corrupt the global data buffer (bd). This patch fixes this issue
by checking and limiting this area.

Signed-off-by: Yuri Tikhonov <yur@emcraft.com>
Signed-off-by: Stefan Roese <sr@denx.de>

diff --git a/post/drivers/memory.c b/post/drivers/memory.c
index a2c088bad8d5f3cf274b4e62085e9b664f96cedd..fbc349a852fba29e7484af7c664e1bd0ebd73a13 100644 (file)
--- a/post/drivers/memory.c
+++ b/post/drivers/memory.c
@@ -461,6 +461,9 @@ int memory_post_test (int flags)
        unsigned long memsize = (bd->bi_memsize >= 256 << 20 ?
                                 256 << 20 : bd->bi_memsize) - (1 << 20);
 
+       /* Limit area to be tested with the board info struct */
+       if (CFG_SDRAM_BASE + memsize > (ulong)bd)
+               memsize = (ulong)bd - CFG_SDRAM_BASE;
 
        if (flags & POST_SLOWTEST) {
                ret = memory_post_tests (CFG_SDRAM_BASE, memsize);