There are two versions of the A83t processor; per the provided Linux code from Allwinner revisions A and B can be distingushed by the lower bit of the SRAM ID register. The distinction is important because revision B requires a SMP bringup workaround.
Signed-off-by: Timothy Pearson tpearson@raptorengineering.com --- arch/arm/mach-sunxi/cpu_info.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-sunxi/cpu_info.c b/arch/arm/mach-sunxi/cpu_info.c index 76b6719..d552061 100644 --- a/arch/arm/mach-sunxi/cpu_info.c +++ b/arch/arm/mach-sunxi/cpu_info.c @@ -50,6 +50,17 @@ uint sunxi_get_sram_id(void)
return id; } + +uint sunxi_get_revision(void) +{ + uint rev; + + /* Unlock sram info reg, read it, relock */ + rev = readl(SUNXI_SRAMC_BASE + 0x24) & 0x1; + + return rev; +} + #endif
#ifdef CONFIG_DISPLAY_CPUINFO @@ -84,7 +95,7 @@ int print_cpuinfo(void) #elif defined CONFIG_MACH_SUN8I_A33 printf("CPU: Allwinner A33 (SUN8I %04x)\n", sunxi_get_sram_id()); #elif defined CONFIG_MACH_SUN8I_A83T - printf("CPU: Allwinner A83T (SUN8I %04x)\n", sunxi_get_sram_id()); + printf("CPU: Allwinner A83T (SUN8I %04x rev. %s)\n", sunxi_get_sram_id(), (sunxi_get_revision() == 0)?"A":"B"); #elif defined CONFIG_MACH_SUN8I_H3 printf("CPU: Allwinner H3 (SUN8I %04x)\n", sunxi_get_sram_id()); #elif defined CONFIG_MACH_SUN9I