[U-Boot] [PATCH v2] at91sam9x5ek: Pass serial and revision tags to Linux

[Bo Shen]

Hi Julius,

On 5/3/2013 18:54, Julius Hemanth P wrote:
> This code is small snippet from patch
> ftp://ftp.linux4sam.org/pub/uboot/u-boot-v2010.06/u-boot-5series_1.0.patch
>
> Bug:-

I think this should not report bug, it should for compatible with old 
kernel (only for Linux 2.6.39 released on www.at91.com/linux4sam).

>   For board at91sam9x5ek, U-boot doesn't pass serial and revision tags
> to Linux kernel, hence kernel fails to identify correct revision and assumes
> as rev-A, resulting in failing to detect NAND device.
>
> This patch enables u-boot to pass serial and revision tags to Linux
> kernel, which helps Linux to detect NAND device.
>
> Signed-off-by: Julius Hemanth <juliushemanth at gmail.com>
> ---
> Changes for v2:
>          - access GPBR using c structure
>          - removed tailing 1 for #define
>          - s/Miscelaneous/Miscellaneous
>          - s/initialisations/initializations
>
>   board/atmel/at91sam9x5ek/at91sam9x5ek.c |   33 ++++++++++++++++++++++++++++++-
>   include/configs/at91sam9x5ek.h          |    5 ++++
>   2 files changed, 37 insertions(+), 1 deletions(-)

This patch can not be applied based on u-boot master branch or else on 
u-boot-atmel master branch.

Please re-generate this patch based on u-boot master branch or 
u-boot-atmel master branch.

> diff --git a/board/atmel/at91sam9x5ek/at91sam9x5ek.c
> b/board/atmel/at91sam9x5ek/at91sam9x5ek.c
> index 8773e6f..c05bdb7 100644
> --- a/board/atmel/at91sam9x5ek/at91sam9x5ek.c
> +++ b/board/atmel/at91sam9x5ek/at91sam9x5ek.c
> @@ -27,6 +27,7 @@
>   #include <asm/arch/at91_common.h>
>   #include <asm/arch/at91_pmc.h>
>   #include <asm/arch/at91_rstc.h>
> +#include <asm/arch/at91_gpbr.h>
>   #include <asm/arch/gpio.h>
>   #include <asm/arch/clk.h>
>   #include <lcd.h>
> @@ -48,8 +49,34 @@ DECLARE_GLOBAL_DATA_PTR;
>
>   /* ------------------------------------------------------------------------- */
>   /*
> - * Miscelaneous platform dependent initialisations
> + * Miscellaneous platform dependent initializations
>    */
> +
> +#ifdef CONFIG_LOAD_ONE_WIRE_INFO
> +static u32 system_rev;
> +static u32 system_serial_low;
> +
> +u32 get_board_rev(void)
> +{
> +       return system_rev;
> +}
> +
> +void get_board_serial(struct tag_serialnr *serialnr)
> +{
> +       serialnr->high = 0; /* Not used */
> +       serialnr->low = system_serial_low;
> +}
> +
> +void load_1wire_info(void)
> +{
> +       at91_gpbr_t *gpbr = (at91_gpbr_t *) ATMEL_BASE_GPBR;
> +
> +       /* serial is in GPBR #2 and revision is in GPBR #3 */
> +       system_serial_low = readl(gpbr->reg[2]);
> +       system_rev = readl(gpbr->reg[3]);
> +}

This is wrong which will cause u-boot hang up. It should be:

system_serial_low = readl(&gpbr->reg[2]);
system_rev = readl(&gpbr->reg[3]);

Best Regards,
Bo Shen