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

[Jason Thorpe <thorpej%me.com@localhost>]

> On Aug 21, 2021, at 11:11 AM, Tobias Nygren <tnn%netbsd.org@localhost> wrote:
> 
> On Sat, 21 Aug 2021 10:52:06 -0700
> Jason Thorpe <thorpej%me.com@localhost> wrote:
> 
>> The first stage loader (presumably in mask ROM) is able to load the second stage loader (i.e. "VIC-20 mode" :-) from SPI just fine.  If I remove start4.elf from the ESP then I can watch the second stage loader cycle through the boot order:
>> 
>> 	https://share.icloud.com/photos/07VV-jR8vYTJSBgkUJx5WI5KQ
>> 
>> So it seems that it's the code in start4.elf that's going off the rails, and I'm just using the one that came with the UEFI bundle.
> 
> You should not see that screen at all.

Yes, I know. I forced it by removing start4.elf to demonstrate that the second stage loader was being fetched from the SPI EEPROM correctly.

> After it has loaded UEFI
> firmware, it will instead show a full screen Raspberry PI logo with the
> prompt below on both the HDMI ports and serial console.

Right, the problem is that it (start4.elf, I guess, since that's what supposed to be driving the boot process after the secondary loader) is not loading the UEFI firmware.

> ESC (setup), F1 (shell), ENTER (boot)...
> 
> I think your RPI has trouble reading the FAT partition itself.
> I'm not sure how the prebuilt NetBSD images are laid out.
> What I have on my SD card is ...
> 
> 0: Primary DOS with 32 bit FAT - LBA (sysid 12)
>    start 64, size 524224 (256 MB, Cyls 0-32/162/2)
> 
> ... onto which I did newfs_msdos(8), unzipped the UEFI firmware,
> installed /efi/boot/bootaa64.efi and nothing else.

Here's what mine is... (again, from Jared's Generic-64 image):

dhcp-178:thorpej$ sudo fdisk /dev/rdisk4
Disk: /dev/rdisk4	geometry: 3891/255/63 [62521344 sectors]
Signature: 0xAA55
         Starting       Ending
 #: id  cyl  hd sec -  cyl  hd sec [     start -       size]
------------------------------------------------------------------------
*1: 0C    2  10   9 -   12  60  48 [     32768 -     163840] Win95 FAT32L
 2: 00    0   0   0 -    0   0   0 [         0 -          0] unused      
 3: 00    0   0   0 -    0   0   0 [         0 -          0] unused      
 4: EE    0   0   2 -    2  10   8 [         1 -      32767] <Unknown ID>
dhcp-178:thorpej$ 

This should be exactly the one that's produced by the NetBSD daily builds (i.e. there's no u-boot injected into this one).  But I'll fetch one from the NetBSD dailies and see if that makes any difference.

-- thorpej