Dear Will Tucker,
Hi,
I’m trying to get the ATSAM9G20-EK booting from SD/MMC on MCI A, with the Nand and Dataflash disabled, with no luck.
I have gotten the latest u-boot-atmel compiled and placed boot.bin on a FAT 16 formatted. When I turn power on I only get RomBoot on the debug uart.
- Do I need to use the latest AT91Bootstrap, I have v1.16 but do not see any
way to enable the mci
If I need an update where can I get the latest version?
Any help would be appreciated,
Will Tucker
First, please observe the following: 1. Start a new thread for comments/questions unrelated to the existing thread. 2. Always post the u-boot mailing list as well. 3. Please make your lines wrap at less than 80 characters.
To give a brief answer to your issue:
Please study sections 8 and 13 of the 9G20 datasheet. As a result you will see that the ROM will try to load "boot.bin" to internal SRAM. This will limit the image size to 16K. Apparently that cannot be u-boot itself. This 16k code would need to initialize SDRAM and load another, larger file (e.g. u-boot.bin) from SD/MMC into SDRAM. I don't know whether AT91Bootstrap sources already handle such a situation. Latest Versions you will find on the Atmel Website.
Please note that this is not an u-boot issue.
The patch "SD/MMC support" for u-boot enables to access SD/MMC from u-boot ONCE it is running.
Best Regards, Reinhard