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author | Peng Fan <peng.fan@nxp.com> | 2016-05-04 15:27:50 +0800 |
---|---|---|
committer | Tom Rini <trini@konsulko.com> | 2016-05-06 10:43:39 -0400 |
commit | ad7af5d7e4caf49581c7403d5a8edc0f11a5f652 (patch) | |
tree | 8c9506f950d5f409413970d08f7b697e65c961fe /arch | |
parent | daa69f5f5dba48406836b1879434fc4af4bb7df7 (diff) | |
download | u-boot-ad7af5d7e4caf49581c7403d5a8edc0f11a5f652.zip u-boot-ad7af5d7e4caf49581c7403d5a8edc0f11a5f652.tar.gz u-boot-ad7af5d7e4caf49581c7403d5a8edc0f11a5f652.tar.bz2 |
imx6: cache: disable L2 before touching Auxiliary Control Register
According PL310 TRM, Auxiliary Control Register
"
The register must be written to using a secure access, and it can be
read using either a secure or a NS access. If you write to this register
with a NS access, it results in a write response with a DECERR response,
and the register is not updated. Writing to this register with the L2
cache enabled, that is, bit[0] of L2 Control Register set to 1,
results in a SLVERR.
"
So If L2 cache is already enabled by ROM, chaning value of ACR
will cause SLVERR and uboot hang.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/arm/imx-common/cache.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/arm/imx-common/cache.c b/arch/arm/imx-common/cache.c index 54b021c..b775488 100644 --- a/arch/arm/imx-common/cache.c +++ b/arch/arm/imx-common/cache.c @@ -43,6 +43,12 @@ void v7_outer_cache_enable(void) /* + * Must disable the L2 before changing the latency parameters + * and auxiliary control register. + */ + clrbits_le32(&pl310->pl310_ctrl, L2X0_CTRL_EN); + + /* * Set bit 22 in the auxiliary control register. If this bit * is cleared, PL310 treats Normal Shared Non-cacheable * accesses as Cacheable no-allocate. @@ -59,9 +65,6 @@ void v7_outer_cache_enable(void) } #endif - /* Must disable the L2 before changing the latency parameters */ - clrbits_le32(&pl310->pl310_ctrl, L2X0_CTRL_EN); - writel(0x132, &pl310->pl310_tag_latency_ctrl); writel(0x132, &pl310->pl310_data_latency_ctrl); |