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-rw-r--r--arch/arm/plat-s3c64xx/cpu.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm/plat-s3c64xx/cpu.c b/arch/arm/plat-s3c64xx/cpu.c
index f9fdaab32ab..19f68b5f0d3 100644
--- a/arch/arm/plat-s3c64xx/cpu.c
+++ b/arch/arm/plat-s3c64xx/cpu.c
@@ -126,6 +126,14 @@ void __init s3c64xx_init_io(struct map_desc *mach_desc, int size)
iotable_init(mach_desc, size);
idcode = __raw_readl(S3C_VA_SYS + 0x118);
+ if (!idcode) {
+ /* S3C6400 has the ID register in a different place,
+ * and needs a write before it can be read. */
+
+ __raw_writel(0x0, S3C_VA_SYS + 0xA1C);
+ idcode = __raw_readl(S3C_VA_SYS + 0xA1C);
+ }
+
s3c_init_cpu(idcode, cpu_ids, ARRAY_SIZE(cpu_ids));
}