i.MX8M Mini Hangs at ATF when booting from USB

[Adam Ford]

On Mon, Jan 31, 2022 at 2:25 PM Michael Nazzareno Trimarchi
<michael at amarulasolutions.com> wrote:
>
> HI Adam
>
> On Mon, Jan 31, 2022 at 9:21 PM Adam Ford <aford173 at gmail.com> wrote:
> >
> > I have a situation where the same Flash.bin file can boot an MMC card,
> > but hang when booting over USB.
> >
> > In both cases, I can see the FIT file is loaded, and the various items
> > are identified and placed in their respective folders memory
> > locations.  The only difference I can see is that when jumping to
> > 0x920000 (ATF), the USB booting hangs and ATF doesn't appear to
> > execute.  Is there some special command that I need to issue to unlock
> > this memory to execute from it when booting from USB?  I am calling
> > enable_tzc380 from SPL, and I read the first 100 bytes and last 100
> > bytes and compared it to my bl31.bin file, and it appears to match, so
> > I know I can read from it.
> >
> > U-Boot SPL 2022.01-00836-g3cc200c91a-dirty (Jan 30 2022 - 07:31:51 -0600)
> > No pmic
> > WDT:   Not starting watchdog at 30280000
> > Trying to boot from USB SDP
> > USB EHCI 1.00
> > SDP: initialize...
> > SDP: handle requests...
> > Downloading file of size 832080 to 0x40400000... done
> > Jumping to header at 0x40400000
> > Header Tag is not an IMX image
> > Found header at 0x40417c00
> > firmware: 'uboot'
> > External data: dst=40200000, offset=3000, size=9ddd8
> > fdt: 'fdt-1'
> > External data: dst=4029de00, offset=aaea0, size=87b0
> > loadables: 'atf'
> > External data: dst=920000, offset=a0dd8, size=a0c6
> > image entry point: 0x920000
> >
>
> Check if the uart used on atf and uboot are mapping correctly (but
> this should because you can boot from sdcard)

As far as i can tell, I have not done any differently in the serial
from the NXP downstream.

> ENV_IS_EVERYWHERE in configs file. It's no PMIC a problem when you jump in atf?

I have experimented with and without ENV_IS_EVERYWHERE, but that only
seemed to help my imx8m Nano when jumping from ATF -> U-Boot.  As for
my Mini, the jump from SPL->ATF seems to be the issue.

What might the PMIC have to do with the ATF?  From what I can tell,
the PMIC is pre-configured and the default voltages appear to boot the
MMC.  i had to disable the PMIC driver in order to make room for the
USB code.  I have a few lines of code in my board's spl.c file to
setup a few registers based on NXP's original 8MM design and reference
software.

adam
>
> Michael
>
> > <hang>
>
>
>
> --
> Michael Nazzareno Trimarchi
> Co-Founder & Chief Executive Officer
> M. +39 347 913 2170
> michael at amarulasolutions.com
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