From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Nelson <eric.nelson@boundarydevices.com>
Date: Tue, 13 Mar 2012 08:40:20 -0700
Subject: [U-Boot] [PATCH v2] mx6: Read silicon revision from register
In-Reply-To: <1331648310-13064-1-git-send-email-fabio.estevam@freescale.com>
References: <1331648310-13064-1-git-send-email-fabio.estevam@freescale.com>
Message-ID: <4F5F6A64.9070603@boundarydevices.com>
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To: u-boot@lists.denx.de

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