Hi,
Am 31.01.2014 um 13:40 schrieb Grazvydas Ignotas:
Hello,
On Fri, Jan 31, 2014 at 11:20 AM, Dr. H. Nikolaus Schaller hns@goldelico.com wrote:
... So my proposal is to have it simply as in the EVM: boot from SD (only one slot is boot capable!) and if no SD, boot from eMMC.
This means people can either have their full bootable system on SD. They can still boot from eMMC if they don't insert the SD. Or they always boot from eMMC because they use non-bootable SD card.
Can it really fallback to eMMC if non-bootable card is inserted?
That is how I interpret the boot rom search sequence (try one after the other until successful). Otherwise it would not make sense to have a "sequence" at all.
And AFAIK the OMAP3 will also boot from NAND if the inserted SD card can't boot - even if we press the boot from SD button (to force the 1st SD 2nd NAND boot order). It may just take some milliseconds to find that the SD has no working system on it.
Having to remove the card just to boot the system would be extremely annoying and confuse the users..
But we should easily be able to test it on the EVM with the default switch settings. If we program the eMMC there it should boot with/without SD card. And only from the SD card if it has an MLO in the first partition.
BR, Nikolaus