[U-Boot] [PATCH v3 1/4] mips: add base support for atheros ath79 based SOCs

Wills Wang
2015-12-27T11:37:16Z

On 12/27/2015 07:04 PM, Marek Vasut wrote:
> On Sunday, December 27, 2015 at 11:18:25 AM, Wills Wang wrote:
>> On 12/27/2015 06:09 PM, Marek Vasut wrote:
>>> On Sunday, December 27, 2015 at 09:07:36 AM, Wills Wang wrote:
>>>> On 12/27/2015 03:38 PM, Marek Vasut wrote:
>>>>> On Sunday, December 27, 2015 at 08:33:26 AM, Wills Wang wrote:
>>>>>> On 12/27/2015 02:37 AM, Marek Vasut wrote:
>>>>>>> On Saturday, December 26, 2015 at 07:29:51 PM, Wills Wang wrote:
>>>>>>>> WASP is ar9341.
>>>>>>> Please do not top post.
>>>>>>>
>>>>>>> Did you try if the memory is accessible on your platform ? AR9331 I
>>>>>>> have here has the SRAM at 0xbd007000 , just like that machine in [1]
>>>>>>> .
>>>>>> I found there is a memory segment at 0xbd000000...0xbd007fff. it's
>>>>>> independent of DDR physical memory, can be read and wrote, but
>>>>>> hardware can't boot up if don't execute lowlevel_init.S when define
>>>>>> CONFIG_SYS_INIT_SP_ADDR=0xbd007000 to set C stack into SRAM.
>>>>> Stack grows down, so of course if you put stack at the beginning of
>>>>> SRAM, that cannot work ;-) Put it at the end , 0xbd008000.
>>>> This memory segment was mapped circularly at 0xbd000000...0xbdffffff.
>>> So is this area at 0xbd008000 usable for stack or not ?
>> Same times board can boot up, but in a very unstable. i use the
>> following setting:
>>
>> #define CONFIG_SYS_INIT_RAM_ADDR 0xbd000000
> Should be 0xbd007000
>
>> #define CONFIG_SYS_INIT_RAM_SIZE (32 * SZ_1K)
> Should be 4 KiB large.
>
>> #define CONFIG_SYS_INIT_SP_OFFSET \
>> (CONFIG_SYS_INIT_RAM_SIZE - GENERATED_GBL_DATA_SIZE)
>> #define CONFIG_SYS_INIT_SP_ADDR \
>> (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_INIT_SP_OFFSET)
> Did you investigate why the board has problems ?
"lowlevel_init.S" can't be dropped.
>
> Best regards,
> Marek Vasut
>
>

--
Best Regards
Wills