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(®s, bank, word, val, __func__); if (ret) return ret;