i re-open a thread from a previous post, that was at a certain point not discussed anymore for missing of information.
I read that eMMC "Fast Boot" should fast-up a bit the eMMC boot process, at least this seems to be confirmed from the
boot flow charts. Not sure it can be useful in my case, where i just boot a 250KB u-boot, but if it can improve the boot time, even few
milliseconds, it can be good for me.
Here my updated situation:
- If i try to enable Fast Boot option, with or without "boot ack" (bootstrap pin as per imx6q user manual, page 404, table, row 3, so with BOOT_CFG1 set), i can't boot anymore.
- eMMC is configured to boot from first boot sector EXT_CSD set to boot from boot partition 1, and boot sector is correctly programmed and verified.
Strangely, with BOOT_CFG1 (Fast Boot) unset, i can boot from boot partition 1, as per EXT_CSD, but oscilloscope on CMD and data lines is not showing the fast boot to happen, so seems i am not actually into Fast Boot.
Every help is really appreciated.