[PATCH u-boot-marvell 00/13] Yet another kwboot improvements

[Stefan Roese]

On 27.10.21 16:10, Pali Rohár wrote:

<snip>

>> Perfect! So it really looks like that issue is in the code which resets
>> baudrate back to the value 115200.
>>
>> I have there another diff which removes usage of the stack in code which
>> resets baudrate back to default value:
>>
>> diff --git a/tools/kwboot.c b/tools/kwboot.c
>> index b56c9a0c8104..8f0e50501398 100644
>> --- a/tools/kwboot.c
>> +++ b/tools/kwboot.c
>> @@ -1444,6 +1444,11 @@ _inject_baudrate_change_code(void *img, size_t *size, int pre,
>>   	memcpy(code, kwboot_baud_code, codesz - 8);
>>   	*(uint32_t *)(code + codesz - 8) = cpu_to_le32(old_baud);
>>   	*(uint32_t *)(code + codesz - 4) = cpu_to_le32(new_baud);
>> +
>> +	if (!pre) {
> 
> Ou, there is a mistake, it should be "if (pre) {"
> 
>> +		*(uint32_t *)code = cpu_to_le32(0xe1a00000); /* arm nop */
>> +		*(uint32_t *)(code + codesz - 4*7) = cpu_to_le32(0xe12fff1e); /* bx lr */
>> +	}
>>   }
>>   
>>   static int
>>
>> Could you try to apply this change instead of my previous one?

Tested with this corrected patch:

  97 % 
[......................................................................]
  99 % [................... 
       ]
Done
Finishing transfer
Waiting 2s for baudrate change magic

Changing baudrate back to 115200 Bd

[Type Ctrl-\ + c to quit]


U-Boot 2021.10-00916-gc6142e537e88-dirty (Oct 27 2021 - 17:23:24 +0200)

SoC:   MV78260-B0 at 1333 MHz
I2C:   ready
DRAM:  2 GiB (667 MHz, 64-bit, ECC not enabled)
Loading Environment from SPIFlash... SF: Detected m25p128 with page size 
256 Bytes, erase size 256 KiB, total 16 MiB
OK
Model: Marvell Armada XP theadorable
...

Perfect. This works on Armada XP. :)

Still I see no speed change. But this is a different story...

Thanks,
Stefan