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Re: RPI4 (8GB) + UEFI -> bricked?
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:
> using the v1.29 release, and also performed the EEPROM update as
> 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
> 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
Looks like this:
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.
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