From aabd7ddb889aec3c6c4139974f66a44e2ce46ba5 Mon Sep 17 00:00:00 2001
From: York Sun <yorksun@freescale.com>
Date: Mon, 7 Dec 2015 11:05:29 -0800
Subject: [PATCH] common: Rewrite hiding the end of memory
As the name may be confusing, the CONFIG_SYS_MEM_TOP_HIDE reserves
some memory from the end of ram, tracked by gd->ram_size. It is not
always the top of u-boot visible memory. Rewrite the macro with a
weak function to provide flexibility for complex calcuation. Legacy
use of this macro is still supported.
Signed-off-by: York Sun <yorksun@freescale.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
---
README | 2 +-
common/board_f.c | 23 +++++++++++++++--------
2 files changed, 16 insertions(+), 9 deletions(-)
diff --git a/README b/README
index 6ea1af2678..4aa2aaeb23 100644
--- a/README
+++ b/README
@@ -3877,7 +3877,7 @@ Configuration Settings:
the RAM base is not zero, or RAM is divided into banks,
this variable needs to be recalcuated to get the address.
-- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
+- CONFIG_SYS_MEM_TOP_HIDE:
If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
this specified memory area will get subtracted from the top
(end) of RAM and won't get "touched" at all by U-Boot. By
diff --git a/common/board_f.c b/common/board_f.c
index bd5a486248..8094ac4efe 100644
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -317,6 +317,15 @@ __weak ulong board_get_usable_ram_top(ulong total_size)
return gd->ram_top;
}
+__weak phys_size_t board_reserve_ram_top(phys_size_t ram_size)
+{
+#ifdef CONFIG_SYS_MEM_TOP_HIDE
+ return ram_size - CONFIG_SYS_MEM_TOP_HIDE;
+#else
+ return ram_size;
+#endif
+}
+
static int setup_dest_addr(void)
{
debug("Monitor len: %08lX\n", gd->mon_len);
@@ -333,19 +342,17 @@ static int setup_dest_addr(void)
*/
gd->secure_ram = gd->ram_size;
#endif
-#if defined(CONFIG_SYS_MEM_TOP_HIDE)
/*
* Subtract specified amount of memory to hide so that it won't
* get "touched" at all by U-Boot. By fixing up gd->ram_size
* the Linux kernel should now get passed the now "corrected"
- * memory size and won't touch it either. This should work
- * for arch/ppc and arch/powerpc. Only Linux board ports in
- * arch/powerpc with bootwrapper support, that recalculate the
- * memory size from the SDRAM controller setup will have to
- * get fixed.
+ * memory size and won't touch it either. This has been used
+ * by arch/powerpc exclusively. Now ARMv8 takes advantage of
+ * thie mechanism. If memory is split into banks, addresses
+ * need to be calculated.
*/
- gd->ram_size -= CONFIG_SYS_MEM_TOP_HIDE;
-#endif
+ gd->ram_size = board_reserve_ram_top(gd->ram_size);
+
#ifdef CONFIG_SYS_SDRAM_BASE
gd->ram_top = CONFIG_SYS_SDRAM_BASE;
#endif
--
2.39.5