[U-Boot] [PATCH 1/2] DEBUG: fix relocation address

[Tetsuyuki Kobayashi]

U-Boot from NOR flash relocates itself to RAM erea. The relocation address is
calaculated at runtime to get maxium contiguous space to load kernel. So it may
vary after code changed. In the early debug phase it would be easier to handle
if the relocation address does not change.
This patch sets relocation address to fixed address specified by
CONFIG_DEBUG_RELOC_FIX_ADDR. If there is no enough space after
CONFIG_DEBUG_RELOC_FIX_ADDR, it is ignored.
patch to kzm9g.h is a example. CONFIG_DEBUG_RELOC_FIX_ADDR should be defined at
each config file.

Signed-off-by: Tetsuyuki Kobayashi <koba at kmckk.co.jp>
---
 arch/arm/lib/board.c    |    9 ++++++++-
 include/configs/kzm9g.h |    4 ++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/arch/arm/lib/board.c b/arch/arm/lib/board.c
index 92cad9a..340aa6e 100644
--- a/arch/arm/lib/board.c
+++ b/arch/arm/lib/board.c
@@ -377,7 +377,14 @@ void board_init_f(ulong bootflag)
 	addr &= ~(4096 - 1);
 
 	debug("Reserving %ldk for U-Boot at: %08lx\n", gd->mon_len >> 10, addr);
-
+#ifdef CONFIG_DEBUG_RELOC_FIX_ADDR
+	if (addr >= CONFIG_DEBUG_RELOC_FIX_ADDR) {
+		addr = CONFIG_DEBUG_RELOC_FIX_ADDR;
+		debug("Fixing relocation address to %08lx\n", addr);
+	} else {
+		debug("CONFIG_DEBUG_RELOC_FIX_ADDR is ignored. It should be less than %08lx\n", addr);
+	}
+#endif
 #ifndef CONFIG_SPL_BUILD
 	/*
 	 * reserve memory for malloc() arena
diff --git a/include/configs/kzm9g.h b/include/configs/kzm9g.h
index 4898fb6..f96ea3e 100644
--- a/include/configs/kzm9g.h
+++ b/include/configs/kzm9g.h
@@ -23,6 +23,10 @@
 
 #undef DEBUG
 
+/* Uncomment this to relocate to fixed address */
+/*#define CONFIG_DEBUG_RELOC_FIX_ADDR 0x5f800000 */
+
+
 #define CONFIG_RMOBILE
 #define CONFIG_SH73A0
 #define CONFIG_KZM_A9_GT
-- 
1.7.9.5