Re: RPI4 (8GB) + UEFI -> bricked?

[Michael <macallan1888%gmail.com@localhost>]

Hello,

On Fri, 20 Aug 2021 19:05:26 -0700
Jason Thorpe <thorpej%me.com@localhost> wrote:

> Trying to get an RPI4 8GB model I picked up a while ago running with
> the RPI4 UEFI firmware.
> 
> Download Jared's Generic 64-bit images, wrote it to an SD card, then
> followed the instructions here:
> 
> 	https://github.com/pftf/RPi4/blob/master/Readme.md
> 
> using the v1.29 release, and also performed the EEPROM update as
> recommended:
> 
> 	https://github.com/raspberrypi/rpi-eeprom/releases
> 
> What results is the colored square and 7 blinks.  So, I tried writing
> a fresh image onto SD card.  Behavior was different, at least!  I
> guess it was the low-level loader ... VIC-20-like text informing me
> that start4.elf was not compatible that that I needed to update the
> firmware.
> 
> So, anyway, I guess the device is not TOTALLY bricked, but I'm not
> sure how to back out of this corner.  Anybody have any ideas here?

I only tried the 1.29 UEFI firmware on the pi400 - no issues there.
Didn't do any EEPROM updates on the pi400 or the 8GB pi4. IIRC my 8GB
pi4 runs UEFI 1.26 or 1.27. There were issues with earlier releases.
What I did was to take one of Jared's images, wrote it onto an SD card
- or in the pi4's case, a USB disk - deleted everything on the DOS
partition other than the EFI directory, then unzipped the firmware into
it.
Looks like this:
/boot> ll
total 8696
drwxr-xr-x  1 root  wheel     4096 Jul 24  2020 EFI
-rwxr-xr-x  1 root  wheel  2031616 Mar 25 15:13 RPI_EFI.fd
-rwxr-xr-x  1 root  wheel     5328 Apr  9 14:32 Readme.md
-rwxr-xr-x  1 root  wheel    49218 Apr  9 14:32 bcm2711-rpi-4-b.dtb
-rwxr-xr-x  1 root  wheel    48922 Apr  9 14:32 bcm2711-rpi-400.dtb
-rwxr-xr-x  1 root  wheel    49330 Apr  9 14:32 bcm2711-rpi-cm4.dtb
-rwxr-xr-x  1 root  wheel      206 Apr  9 14:32 config.txt
-rwxr-xr-x  1 root  wheel      207 Jul 21  2020 config.txt~
-rwxr-xr-x  1 root  wheel     5442 Apr  9 14:32 fixup4.dat
drwxr-xr-x  1 root  wheel     4096 Jul 24  2020 overlays
-rwxr-xr-x  1 root  wheel  2231456 Apr  9 14:32 start4.elf

What's supposed to happen is something this:
- VIC-20 mode, looks for boot files
- rainbow square for a second or so
- UEFI takes over, RPi logo, loads out loader etc.

I wonder if your start4.elf got corrupted somehow.

have fun
Michael