[U-Boot] [PATCH 13/15] i.MX7ULP: Add CPU revision check for B0

[Peng Fan]

Since there is no register for CPU revision, we use ROM version to
check the A0 or B0 chip.

Signed-off-by: Peng Fan <peng.fan at nxp.com>
---
 arch/arm/mach-imx/mx7ulp/soc.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-imx/mx7ulp/soc.c b/arch/arm/mach-imx/mx7ulp/soc.c
index 7119ee4a07..6c53aa106e 100644
--- a/arch/arm/mach-imx/mx7ulp/soc.c
+++ b/arch/arm/mach-imx/mx7ulp/soc.c
@@ -18,10 +18,13 @@ struct imx_sec_config_fuse_t const imx_sec_config_fuse = {
 };
 #endif
 
+#define ROM_VERSION_ADDR 0x80
 u32 get_cpu_rev(void)
 {
-	/* Temporally hard code the CPU rev to 0x73, rev 1.0. Fix it later */
-	return (MXC_CPU_MX7ULP << 12) | (1 << 4);
+	/* Check the ROM version for cpu revision */
+	u32 rom_version = readl((void __iomem *)ROM_VERSION_ADDR);
+
+	return (MXC_CPU_MX7ULP << 12) | (rom_version & 0xFF);
 }
 
 #ifdef CONFIG_REVISION_TAG
-- 
2.16.4