linux-kernel - Re: [PATCH] AT91: at91sam9g10 chip identification changed

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Date:	Tue, 13 Apr 2010 09:42:55 +0200
From:	Andrew Victor <avictor.za@...il.com>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] AT91: at91sam9g10 chip identification changed

hi Nicolas,

> A bit in the at91sam9g10 identification number changed between Engineering
> Sample and final product. This patch will identify both as being at91sam9g10.

> -#define ARCH_ID_AT91SAM9G10    0x819903a0
> +#define ARCH_ID_AT91SAM9G10    0x019903a0

> -#define cpu_is_at91sam9g10()   (at91_cpu_identify() == ARCH_ID_AT91SAM9G10)
> +#define cpu_is_at91sam9g10()   ((at91_cpu_identify() & ~AT91_CIDR_EXT) == ARCH_ID_AT91SAM9G10)


Wouldn't it be better to just mask out the AT91_CIDR_EXT bit in
at91_cpu_identify()?
That bit isn't really useful for "version" information.

We'd then just need to modify:
  #define ARCH_ID_AT91SAM9G10          0x019903a0
  #define ARCH_ID_AT91SAM9G45          0x019b05a0
  #define ARCH_ID_AT91SAM9G45MRL  0x019b05a2      /* aka 9G45-ES2 &
non ES lots */
  #define ARCH_ID_AT91SAM9G45ES     0x019b05a1      /* 9G45-ES
(Engineering Sample) */
(ie, drop bit AT91_CIDR_EXT)


Regards,
  Andrew Victor
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