[PATCH 2/3] k3-am62-pocketbeagle2: add initial board support

[Marko Mäkelä]

Hi Robert, all,

I finally came across to testing this again. A more careful comparison 
between Robert's build script and mine showed that my build of 
trusted-firmware-a was missing the parameter 
PRELOADED_BL33_BASE=0x82000000. Once I specified that parameter, u-boot 
would fully start up.

Next, I applied this patch series to the current u-boot and reran my 
build script. The output proceeded a little further, but it would hang 
in the middle of U-boot initialization:

--- snip ---
U-Boot SPL 2026.07-rc1 (May 11 2026 - 17:57:58 +0000)
SYSFW ABI: 4.0 (firmware rev 0x000b '11.2.5--v11.02.05 (Fancy Rat)')
Set clock rates for '/a53 at 0', CPU: 1250MHz at Speed Grade 'T'
SPL initial stack usage: 13464 bytes
Trying to boot from MMC2
Authentication passed
Authentication passed
Authentication passed
Authentication passed
Authentication passed
Starting ATF on ARM64 core...


U-Boot SPL 2026.07-rc1 (May 11 2026 - 17:58:12 +0000)
SYSFW ABI: 4.0 (firmware rev 0x000b '11.2.5--v11.02.05 (Fancy Rat)')
SPL initial stack usage: 2048 bytes
Trying to boot from MMC2
Authentication passed
Authentication passed


U-Boot 2026.07-rc1 (May 11 2026 - 17:58:12 +0000)

SoC:   AM62X SR1.0 HS-FS
Reset reason: POR
Model: BeagleBoard.org PocketBeagle2
DRAM:  448 MiB (total 512 MiB)
--- snip ---

When I compiled Robert's version of u-boot 
(ef03e35488377a32cdd4f76d1a03ef7f60c798ef from January 30), I would land 
in a menu like this:

--- snip ---
U-Boot 2026.01 (May 11 2026 - 17:38:46 +0000)

SoC:   AM62X SR1.0 HS-FS
Reset reason: POR
Model: BeagleBoard.org PocketBeagle2
DRAM:  512 MiB
Core:  89 devices, 32 uclasses, devicetree: separate
MMC:   mmc at fa10000: 0, mmc at fa00000: 1
Loading Environment from nowhere... OK
In:    serial at 2860000
Out:   serial at 2860000
Err:   serial at 2860000
Net:   No ethernet found.
Press SPACE to abort autoboot in 0 seconds
switch to partitions #0, OK
mmc1 is current device
SD/MMC found on device 1
Failed to load 'uEnv.txt'
Scanning for bootflows in all bootdevs
Seq  Method       State   Uclass    Part  Name                      Filename
---  -----------  ------  --------  ----  ------------------------  ----------------
Scanning bootdev 'mmc at fa00000.bootdev':
   0  extlinux     ready   mmc          1  mmc at fa00000.bootdev.part_ /extlinux/extlinux.conf
** Booting bootflow 'mmc at fa00000.bootdev.part_1' with extlinux
PocketBeagle 2 microSD (extlinux.conf) (swap enabled)
1:	microSD (failsafe)
2:	copy microSD to eMMC
3:	microSD (debug)
4:	microSD (default)
5:	techlab
6:	techlab workshop
Enter choice:
--- snip ---

Should I apply the patch set to an older revision of U-boot? As far as I 
can tell, it may now be hanging related to some DRAM layout or device 
tree mismatch.

	Marko