[U-Boot] [PATCH 1/5] ARM: keystone2: configs: Move SP to end of u-boot section

[Lokesh Vutla <a0131933@ti.com>]

Hi Nishanth,
On Monday 17 August 2015 08:01 PM, menon.nishanth at gmail.com wrote:
> On Mon, Aug 17, 2015 at 9:24 AM, Lokesh Vutla <lokeshvutla@ti.com> wrote:
>> Currently u-boot stack is defined at the beginning of MSMC RAM.
>> This is a problem for uart boot mode as ROM downloads directly to
>> starting of MSMC RAM.
>> Fixing it by moving stack to the end of u-boot section and shifting
>> SYS_TEXT_BASE to the start of MSMC RAM.
>> Updated division of MSMC RAM is shown below:
>>         -----------------------------------------
>>         |               |       |               |
>>         | U-Boot text   |U-Boot | SPL text      |
>>         | download      | Stack | Download +    |
>>         |               |       | SPL_BSS +     |
>>         |               |       | SPL_STACK     |
>>         -----------------------------------------
>>         [1]             [2]     [3]             [4]
>>
>> [1] SYS_TEXT_BASE (Start of MSMC RAM)
>> [2] SPL_TEXT_BASE - GBL_DATA_SIZE
>> [3] SPL_TEXT_BASE
>> [4] END of SPL
>>
>> [1] + [2] is at least 1M on all platforms, so no chance of overlap.
>>
>> Reviewed-by: Nishanth Menon <nm@ti.com>
>> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
>> ---
>>  include/configs/ti_armv7_keystone2.h | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/include/configs/ti_armv7_keystone2.h b/include/configs/ti_armv7_keystone2.h
>> index b441590..58c98ce 100644
>> --- a/include/configs/ti_armv7_keystone2.h
>> +++ b/include/configs/ti_armv7_keystone2.h
>> @@ -20,7 +20,7 @@
>>  /* SoC Configuration */
>>  #define CONFIG_ARCH_CPU_INIT
>>  #define CONFIG_SYS_ARCH_TIMER
>> -#define CONFIG_SYS_TEXT_BASE           0x0c001000
>> +#define CONFIG_SYS_TEXT_BASE           0x0c000000
>>  #define CONFIG_SPL_TARGET              "u-boot-spi.gph"
>>  #define CONFIG_SYS_DCACHE_OFF
>>
>> @@ -29,7 +29,7 @@
>>  #define CONFIG_SYS_LPAE_SDRAM_BASE     0x800000000
>>  #define CONFIG_MAX_RAM_BANK_SIZE       (2 << 30)       /* 2GB */
>>  #define CONFIG_STACKSIZE               (512 << 10)     /* 512 KiB */
>> -#define CONFIG_SYS_INIT_SP_ADDR                (CONFIG_SYS_TEXT_BASE - \
>> +#define CONFIG_SYS_INIT_SP_ADDR                (CONFIG_SPL_TEXT_BASE - \
>>                                         GENERATED_GBL_DATA_SIZE)
>>
>>  /* SPL SPI Loader Configuration */
> 
> This change is great. Now that this patch is done, I might like to see
> the documentation of uart download added in as well - the sequence is
> not really straight forward without documentation to follow
Patch 5/5 does the update in the README.

Thanks and regards,
Lokesh
> 
> Regards,
> Nishanth Menon
>