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 ?
Best regards, Marek Vasut