[U-Boot] [PATCH v2] mx6: Read silicon revision from register

Eric Nelson
2012-03-13T15:40:20Z

On 03/13/2012 07:18 AM, Fabio Estevam wrote:
> Instead of hardcoding the mx6 silicon revision, read it from the proper register.
>
> Signed-off-by: Fabio Estevam<fabio.estevam@freescale.com>
> ---
> Changes since v1:
> - Fix typo on Subject
> arch/arm/cpu/armv7/mx6/soc.c | 3 ++-
> 1 files changed, 2 insertions(+), 1 deletions(-)
>
> diff --git a/arch/arm/cpu/armv7/mx6/soc.c b/arch/arm/cpu/armv7/mx6/soc.c
> index 2ac74b5..639bf30 100644
> --- a/arch/arm/cpu/armv7/mx6/soc.c
> +++ b/arch/arm/cpu/armv7/mx6/soc.c
> @@ -32,7 +32,8 @@
>
> u32 get_cpu_rev(void)
> {
> - int system_rev = 0x61000 | CHIP_REV_1_0;
> + int reg = readl(ANATOP_BASE_ADDR + 0x260)& 0xFF;
> + int system_rev = 0x61000 | 0x10 + reg;
>
> return system_rev;
> }

Nice!
MX6Q SABRELITE U-Boot > md 0x20C8260 1
020c8260: 00630000 ..c.

This beats the heck out of my hack:
http://lists.denx.de/pipermail/u-boot/2012-March/120102.html

Now the question is how get_cpu_rev() relates to get_board_rev().

We had a discussion a while back about reserving some space in OTP
to allow per-board revision information.

Fabio, do you have any guidance about how/whether the system_rev
should be updated to include a board revision?

Please advise,

Eric