MLK-19465 imx8mq: Fix cpu rev issue on B0.1 chip
We read the ROM version to determine the CPU revision before B1 chip.
The rom version is 4 bytes word, it has major version at low byte,
minor version at second byte.
On B0.1 chip, the value is 0x1020 not 0x20, if reading the word and
comparing
with 0x20, the result is wrong.
Fix the issue by only reading the lowest byte for major version.
Signed-off-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit 8d0812e63155cca91ecb78c630a450e7d5e5fd00)
Change-Id: I4187f18b962c1e4bedf58ca3f2c4904786b6e092
diff --git a/arch/arm/cpu/armv8/imx8m/soc.c b/arch/arm/cpu/armv8/imx8m/soc.c
index f326562..858970d 100644
--- a/arch/arm/cpu/armv8/imx8m/soc.c
+++ b/arch/arm/cpu/armv8/imx8m/soc.c
@@ -229,9 +229,9 @@
reg = 0x21;
} else {
uint32_t rom_version;
- rom_version = readl((void __iomem *)0x800);
+ rom_version = readb((void __iomem *)0x800);
if (rom_version != 0x10) {
- rom_version = readl((void __iomem *)0x83c);
+ rom_version = readb((void __iomem *)0x83c);
if (rom_version == 0x20)
reg = 0x20;
}
