The board really has 256M. However, the VC (VideoCore co-processor) shares
the RAM, and uses a configurable portion at the top. We tell U-Boot that a
smaller amount of RAM is present in order to avoid stomping on the area
the VC uses.
Extracted from work by Oleksandr Tymoshenko <go...@bluezbox.com>.
Signed-off-by: Stephen Warren <swar...@wwwdotorg.org>
---
board/raspberrypi/rpi_b/rpi_b.c | 2 +-
include/configs/rpi_b.h | 7 +++++++
2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/board/raspberrypi/rpi_b/rpi_b.c b/board/raspberrypi/rpi_b/rpi_b.c
index 26df74b..688b0aa 100644
--- a/board/raspberrypi/rpi_b/rpi_b.c
+++ b/board/raspberrypi/rpi_b/rpi_b.c
@@ -21,7 +21,7 @@ DECLARE_GLOBAL_DATA_PTR;
int dram_init(void)
{
- gd->ram_size = SZ_256M;
+ gd->ram_size = CONFIG_SYS_SDRAM_SIZE;
return 0;
}
diff --git a/include/configs/rpi_b.h b/include/configs/rpi_b.h
index b9595f9..9f74731 100644
--- a/include/configs/rpi_b.h
+++ b/include/configs/rpi_b.h
@@ -36,6 +36,13 @@
#define CONFIG_NR_DRAM_BANKS 1
#define CONFIG_SYS_TEXT_BASE 0x00008000
#define CONFIG_SYS_SDRAM_BASE 0x00000000
+/*
+ * The board really has 256M. However, the VC (VideoCore co-processor) shares
+ * the RAM, and uses a configurable portion at the top. We tell U-Boot that a
+ * smaller amount of RAM is present in order to avoid stomping on the area
+ * the VC uses.
+ */
+#define CONFIG_SYS_SDRAM_SIZE SZ_128M
#define CONFIG_SYS_UBOOT_BASE CONFIG_SYS_TEXT_BASE
#define CONFIG_SYS_INIT_RAM_SIZE SZ_4K
#define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_SDRAM_BASE + \
--
1.7.9.5
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