Help about Tiny Rex Uboot

[tanbakoo]

Hi,
After previous post about efuse configuration, please send for me some guidance about Uboot for that boot configuration.(main boot from SATA or spi norflash and other option like sd,usb,emmc)
Best Regards

[robertferanec]

We have not tested uBoot in SATA. We only use uBoot from SPI or SD card, but there is no difference between these two (SPI or SD) - they are same uBoot image.

What we do, we often boot from SPI and then run this command to test a uBoot on SD card:

mw.l 0x020d8040 0x2840; mw.l 0x020d8044 0x10000000; reset

There is not much information about these registers, you will need to figure out by yourself how to switch between different SD cards (I think I read somewhere, that you may be able to use the similar command to boot up from SATA too, but I am not 100% sure about that). Of course, the original first uBoot is always loaded from eFuse setting.