[U-Boot] [PATCH 2/2] mxc_ocotp: Disable fuse sense for imx8mq B1

Peng Fan
2019-04-17T09:41:23Z

From: Ye Li <ye.li@nxp.com>

On iMX8MQ Rev B1, reading from fuse box is not allowed. The
OCOTP_READ_FUSE_DATA register is tied to magic number 0xff0055aa
for chip rev. So u-boot has to disable the fuse sense function for it.

Signed-off-by: Ye Li <ye.li@nxp.com>
Tested-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
drivers/misc/mxc_ocotp.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/misc/mxc_ocotp.c b/drivers/misc/mxc_ocotp.c
index 33ea31135c..1b945e9727 100644
--- a/drivers/misc/mxc_ocotp.c
+++ b/drivers/misc/mxc_ocotp.c
@@ -321,6 +321,11 @@ int fuse_sense(u32 bank, u32 word, u32 *val)
struct ocotp_regs *regs;
int ret;

+ if (is_imx8mq() && is_soc_rev(CHIP_REV_2_1)) {
+ printf("mxc_ocotp %s(): fuse sense is disabled\n", __func__);
+ return -EPERM;
+ }
+
ret = prepare_read(&regs, bank, word, val, __func__);
if (ret)
return ret;
--
2.16.4