[PATCHv3 3/4] k3-am62-pocketbeagle2: add support for 1GB variant

[Anshul Dalal]

On Thu Jun 25, 2026 at 4:59 AM IST, Randolph Sapp wrote:
> On Wed Jun 24, 2026 at 4:19 PM CDT, rs wrote:
>> From: Randolph Sapp <rs at ti.com>
>>
>> Take Phytec's current DDR fixup functions and utilize them to
>> dynamically adjust for variants in the pocketbeagle2. There are
>> currently 3 skews, two of which are both 512MB with the same memory
>> configuration, and one which is 1GB using the same CWL and CL settings
>> but a modified density [1].
>>
>> Based off of Bryan Brattlof's patch [2].
>>
>> [1] https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/5411/8G%20Bits%20DDR4%20SDRAM.pdf
>> [2] https://github.com/bryanbrattlof/beagleboot/commit/fb2f022e27427e990d7a33fd001ffb571e13cfc3
>>
>> Signed-off-by: Randolph Sapp <rs at ti.com>
>> ---
>>  board/beagle/pocketbeagle2/Kconfig            |  26 +++++
>>  board/beagle/pocketbeagle2/Makefile           |   2 +
>>  board/beagle/pocketbeagle2/pocketbeagle2.c    | 103 +++++++++++++++++-
>>  .../beagle/pocketbeagle2/pocketbeagle2_ddr.h  |  50 +++++++++
>>  configs/am62_pocketbeagle2_r5_defconfig       |   5 +-
>>  5 files changed, 184 insertions(+), 2 deletions(-)
>>  create mode 100644 board/beagle/pocketbeagle2/pocketbeagle2_ddr.h
>>
>> [snip]
>
> Just thinking out loud here, but maybe we shouldn't take this patch. The
> industrial version, on top of having more memory, also has eMMC. That already
> mandates a new device tree and configuration if people are going to use it as a
> boot method.
>
> Then again, maybe it's convenient for the users who don't care about eMMC? I
> dunno. Seems odd either way.

Since it's technically a different board altogether and not just PB2 w/
extra DDR. I think it might be better if it had a separate DT and we can
decide the correct one based on the EEPROM at runtime using
SPL_MULTI_DTB_FIT which would allow us to still have a single defconfig
in U-Boot.