[U-Boot] [PATCH] malta: use unmapped flash base address

[Gabor Juhos]

The physical base address of the NOR flash is 0x1e000000
on the Malta boards. The hardware also maps the first 4MiB
of the flash into the 0x1fc00000-0x1fffffff range.

Currently, U-Boot uses the mapped address to access the
flash, which does not work in recent qemu versions.

Since commit a427338b222b43197c2776cbc996936df0302f51
(mips_malta: correct reading MIPS revision at 0x1fc00010)
writing to the mapped address space causes a CPU exception.
Due to the exception, U-Boot hangs during boot when it tries
to detect the CFI flash chip.

Use the correct physical address for the MALTA_FLASH_BASE
constant to avoid the problem. The change makes it possible
to start U-Boot on a Malta board emulated with Qemu 1.6.1
and 1.7.0-rc0. It also works on older versions (tested with
1.1.1, 1.2.2, 1.4.2, 1.5.3). The change is not tested on a
real Malta board.

Signed-off-by: Gabor Juhos <juhosg at openwrt.org>
Cc: Daniel Schwierzeck <daniel.schwierzeck at gmail.com>
Cc: Paul Burton <paul.burton at imgtec.com>
---
 arch/mips/include/asm/malta.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/include/asm/malta.h b/arch/mips/include/asm/malta.h
index 9b1100b..bd9043d 100644
--- a/arch/mips/include/asm/malta.h
+++ b/arch/mips/include/asm/malta.h
@@ -44,7 +44,7 @@
 #define MALTA_RESET_BASE		0x1f000500
 #define GORESET				0x42
 
-#define MALTA_FLASH_BASE		0x1fc00000
+#define MALTA_FLASH_BASE		0x1e000000
 
 #define MALTA_REVISION			0x1fc00010
 #define MALTA_REVISION_CORID_SHF	10
-- 
1.7.10