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cygnus: enable mmu 

this is not only for speed but also preventing the cpu from crashing.
the cpu is not happy when cache is cleaned without mmu turned on.

BUG=chrome-os-partner:36691
BRANCH=broadcom-firmware
TEST=boot purin to romstage.

Change-Id: I2445dcc2729798c4fc56fa191cbc8471ef708d08
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 9e35c925b75213e1d35bf191f22c39aaf1726eeb
Original-Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Original-Change-Id: Icaf8c506df258edb99413949e6e3089a2b1a91af
Original-Reviewed-on: https://chrome-internal-review.googlesource.com/199388
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Original-Commit-Queue: Daisuke Nojiri <dnojiri@google.com>
Original-Tested-by: Daisuke Nojiri <dnojiri@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/251306
Reviewed-on: http://review.coreboot.org/9768
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <edward.ocallaghan@koparo.com>
This commit is contained in:
Daisuke Nojiri 2015-02-17 13:43:35 -08:00 committed by Patrick Georgi
parent 128de62e8c
commit e5d5942e15
2 changed files with 11 additions and 3 deletions
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13
src/soc/broadcom/cygnus/bootblock.c
View File

@ -17,13 +17,20 @@
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <arch/cache.h>
#include <bootblock_common.h>
#include <console/console.h>
#include <stddef.h>
#include <symbols.h>
void bootblock_soc_init(void)
{
/*
* typically, this is the place where mmu is initialized to enable
* cache. it helps speed up vboot verification.
* not only for speed but for preventing the cpu from crashing.
* the cpu is not happy when cache is cleaned without mmu turned on.
*/
mmu_init();
mmu_config_range(0, 4096, DCACHE_OFF);
mmu_config_range_kb((uintptr_t)_sram/KiB, _sram_size/KiB,
DCACHE_WRITETHROUGH);
dcache_mmu_enable();
}

1
src/soc/broadcom/cygnus/include/soc/memlayout.ld
View File

@ -31,6 +31,7 @@ SECTIONS
SRAM_START(0x02000000)
REGION(reserved_for_system_status, 0x02000000, 4K, 4)
TTB(0x02004000, 16K) /* must be aligned to 16K */
TTB_SUBTABLES(0x02008000, 1K)
REGION(reserved_for_maskrom, 0x02009400, 4K, 4)
BOOTBLOCK(0x0200A440, 18K)
PRERAM_CBMEM_CONSOLE(0x0200F000, 4K)