hi experts,
trying to use imx6q "eMMC Fast Boot" mode without success. Can't
get any clarification from freescale still, so i try here.
From the imx6q boot flow diagram seems there can be some gain using it.
Once studying on the Micron eMMC i have connected to imx6q, (as per
TN-52-06: Booting from Embedded MMC - JEDEC 4.41 online pdf) i see
this mode is just called "boot mode" or "alternate boot mode", and seems
to allow to boot from SLC mmcblk0boot0 or mmcblk0boot1
partitions setting EXT_CSD[179] partition to 1 or 2 in bits 3to5.
In this way i can boot from mmcblk0boot0. but if i enable the hw
imx6q GPIO BOOT_CFG1[4] "Fast Boot" mode, i cannot boot anymore.
If i look signal with scope, booting i don't see the initial
CMD pulled low as should be for the Boot mode.
If i enable imx6q "fast boot" (BOOT_CFG1[4]) i just see a
continuos and long train of bits on both CMD and CLK from the reset.
So i can boot from special SLC mmcblk0boot0 but without imx6
"Fast Boot" enabled. So i am trying to understand why this Fast Boot
feature (BOOT_CFG1[4] set) can't be used.
In case you can give any help on this it will be really appreciated.
Best regards,
Angelo Dureghello
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