Commit 8be98e93 authored by Ye Li's avatar Ye Li
Browse files

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: default avatarYe Li <>
(cherry picked from commit 8d0812e63155cca91ecb78c630a450e7d5e5fd00)
parent 8c61389c
...@@ -237,9 +237,9 @@ u32 get_cpu_rev(void) ...@@ -237,9 +237,9 @@ u32 get_cpu_rev(void)
reg = 0x21; reg = 0x21;
} else { } else {
uint32_t rom_version; uint32_t rom_version;
rom_version = readl((void __iomem *)0x800); rom_version = readb((void __iomem *)0x800);
if (rom_version != 0x10) { if (rom_version != 0x10) {
rom_version = readl((void __iomem *)0x83c); rom_version = readb((void __iomem *)0x83c);
if (rom_version == 0x20) if (rom_version == 0x20)
reg = 0x20; reg = 0x20;
} }
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