[coreboot-gerrit] New patch to review for coreboot: 0b217f7 FSP platforms: Clear area in CAR for cbmem

[Martin Roth (gaumless@gmail.com)]

Martin Roth (gaumless at gmail.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/8195

-gerrit

commit 0b217f7fde4dddda107680e8ca5a1eabf4562dc5
Author: Martin Roth <gaumless at gmail.com>
Date:   Sun Jan 11 14:58:47 2015 -0700

    FSP platforms: Clear area in CAR for cbmem
    
    cbmem requires that the memory at DCACHE_RAM_BASE be cleared or it
    does not get used.
    
    This patch just clears CAR memory, leaving 4k untouched for stack. The
    stack is very small at this point, and obviously doesn't care whether
    the memory is cleared or not.  The FSP has loaded a pattern into CAR,
    which helps to see the stack usage (and poisons the stack as well).
    
    Change-Id: I829ddc26133353a784dfc01729af9b3bf427e889
    Signed-off-by: Martin Roth <gaumless at gmail.com>
---
 src/mainboard/intel/cougar_canyon2/romstage.c  | 3 +++
 src/soc/intel/fsp_baytrail/romstage/romstage.c | 2 ++
 src/southbridge/intel/fsp_rangeley/romstage.c  | 3 +++
 3 files changed, 8 insertions(+)

diff --git a/src/mainboard/intel/cougar_canyon2/romstage.c b/src/mainboard/intel/cougar_canyon2/romstage.c
index 72832ea..20d884c 100644
--- a/src/mainboard/intel/cougar_canyon2/romstage.c
+++ b/src/mainboard/intel/cougar_canyon2/romstage.c
@@ -180,6 +180,9 @@ void main(FSP_INFO_HEADER *fsp_info_header)
 	u32 pm1_cnt;
 	u16 pm1_sts;
 
+	/* Clear CAR Memory for CBMEM */
+	memset((void *)CONFIG_DCACHE_RAM_BASE,0,DCACHE_RAM_SIZE - 0x1000);
+
 	post_code(0x40);
 
 #if CONFIG_COLLECT_TIMESTAMPS
diff --git a/src/soc/intel/fsp_baytrail/romstage/romstage.c b/src/soc/intel/fsp_baytrail/romstage/romstage.c
index b0b8133..17b62ef 100644
--- a/src/soc/intel/fsp_baytrail/romstage/romstage.c
+++ b/src/soc/intel/fsp_baytrail/romstage/romstage.c
@@ -158,6 +158,8 @@ void main(FSP_INFO_HEADER *fsp_info_header)
 	uint32_t fd_mask = 0;
 	uint32_t fd2_mask = 0;
 
+	/* Clear CAR Memory for CBMEM */
+	memset((void *)CONFIG_DCACHE_RAM_BASE,0,0x3000);
 	post_code(0x40);
 
 	program_base_addresses();
diff --git a/src/southbridge/intel/fsp_rangeley/romstage.c b/src/southbridge/intel/fsp_rangeley/romstage.c
index fba9eb6..778c653 100644
--- a/src/southbridge/intel/fsp_rangeley/romstage.c
+++ b/src/southbridge/intel/fsp_rangeley/romstage.c
@@ -44,6 +44,9 @@ void main(FSP_INFO_HEADER *fsp_info_header)
 	uint32_t fd_mask = 0;
 	uint32_t func_dis = DEFAULT_PBASE + PBASE_FUNC_DIS;
 
+	/* Clear CAR Memory for CBMEM */
+	memset((void *)CONFIG_DCACHE_RAM_BASE,0,DCACHE_RAM_SIZE - 0x1000);
+
 	/*
 	 * Do not use the Serial Console before it is setup.
 	 * This causes the I/O to clog and a side effect is