From 81d93e5c4b83d8b6dcee69de6f4a14ccf6f7114a Mon Sep 17 00:00:00 2001
From: Kumar Gala <galak@kernel.crashing.org>
Date: Mon, 18 Feb 2008 08:09:37 -0600
Subject: [PATCH] ppc: Allow boards to specify effective amount of memory
For historical reasons we limited the stack to 256M because some boards
could only map that much via BATS. However newer boards are capable of
mapping more memory (for example 85xx is capable of doing up to 2G).
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
---
lib_ppc/board.c | 22 +++++++++++++++-------
1 file changed, 15 insertions(+), 7 deletions(-)
diff --git a/lib_ppc/board.c b/lib_ppc/board.c
index 45d1328f21e..fbf1c5d25ab 100644
--- a/lib_ppc/board.c
+++ b/lib_ppc/board.c
@@ -361,6 +361,20 @@ init_fnc_t *init_sequence[] = {
NULL, /* Terminate this list */
};
+#ifndef CONFIG_MAX_MEM_MAPPED
+#define CONFIG_MAX_MEM_MAPPED (256 << 20)
+#endif
+ulong get_effective_memsize(void)
+{
+#ifndef CONFIG_VERY_BIG_RAM
+ return gd->ram_size;
+#else
+ /* limit stack to what we can reasonable map */
+ return ((gd->ram_size > CONFIG_MAX_MEM_MAPPED) ?
+ CONFIG_MAX_MEM_MAPPED : gd->ram_size);
+#endif
+}
+
/************************************************************************
*
* This is the first part of the initialization sequence that is
@@ -419,13 +433,7 @@ void board_init_f (ulong bootflag)
*/
len = (ulong)&_end - CFG_MONITOR_BASE;
-#ifndef CONFIG_VERY_BIG_RAM
- addr = CFG_SDRAM_BASE + gd->ram_size;
-#else
- /* only allow stack below 256M */
- addr = CFG_SDRAM_BASE +
- (gd->ram_size > 256 << 20) ? 256 << 20 : gd->ram_size;
-#endif
+ addr = CFG_SDRAM_BASE + get_effective_memsize();
#ifdef CONFIG_LOGBUFFER
/* reserve kernel log buffer */
--
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