How to re-burn the official SPL and bootloader?

[tonyho]

Hi I'm back again.
There's an error if I use SPI burn tool to re-burn the official uboot/SPL after the new version/upstream uboot has been burned:

Do we have to erase the uboot at new uboot before use the SPI burnning tool?

I use the spi erase to erase in new uboot command line, and it failed:

=> sf protect unlock 0 1000
=> sf erase 0 10000        
ERROR: attempting erase past flash size (0x38)
=> 

Any tips? Thanks.

[tonyho]

This is caused by the UART TX and flashing conflict. Porting the debug command from official fix the problem.

[ddB0515]

I had same error but not caused by UART it was already booted so you need to restart in uBoot and send debug

after that you can connect via I2C ISP tool and do all operation normally