[U-Boot] [PATCH v2] 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 fix the problem. In order to avoid relocation
problems, also update the CONFIG_SYS_{TEXT,MONITOR}_BASE
constants.

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).

Signed-off-by: Gabor Juhos <juhosg at openwrt.org>
Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck at gmail.com>
Cc: Paul Burton <paul.burton at imgtec.com>
---
Changes since v1:
  - update CONFIG_SYS_{TEXT,MONITOR}_BASE constants
  - update commit message
---
 arch/mips/include/asm/malta.h |    2 +-
 include/configs/malta.h       |    4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

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
diff --git a/include/configs/malta.h b/include/configs/malta.h
index 4098e72..458c33a 100644
--- a/include/configs/malta.h
+++ b/include/configs/malta.h
@@ -40,8 +40,8 @@
 /*
  * Memory map
  */
-#define CONFIG_SYS_TEXT_BASE		0xbfc00000 /* Rom version */
-#define CONFIG_SYS_MONITOR_BASE		CONFIG_SYS_FLASH_BASE
+#define CONFIG_SYS_TEXT_BASE		0xbe000000 /* Rom version */
+#define CONFIG_SYS_MONITOR_BASE		CONFIG_SYS_TEXT_BASE
 
 #define CONFIG_SYS_SDRAM_BASE		0x80000000 /* Cached addr */
 #define CONFIG_SYS_MEM_SIZE		(256 * 1024 * 1024)
-- 
1.7.10