[FAQ] TDA4VL-Q1: How to configure DDR size of 4GB in the J721s2 SDK?

The SDK offering for J721s2 currently supports 16GB DDR. 

In order to make the SDK compatible to a 4GB DDR, please apply the below patch in ${PSDKLA}/board-support/u-boot-2021.01+gitAUTOINC+62a9e51344-g62a9e51344

/cfs-file/__key/communityserver-discussions-components-files/791/1323.DDR_5F00_4GB_5F00_Uboot.patch

Note: 

1. The above patch is created on SDK 8.6.

2. Changes regarding the reduction in the DDR instance happens only in the u-boot.

After applying this patch, build the u-boot binaries and copy the same to the boot partition as shown below:

cd ${PSDKLA}
make u-boot_clean
make u-boot

sudo cp board-support/k3-image-gen-2022.01/tiboot3.bin /media/nikhil/BOOT/tiboot3.bin
sudo cp board-support/u-boot_build/a72/tispl.bin /media/nikhil/BOOT/tispl.bin
sudo cp board-support/u-boot_build/a72/u-boot.img /media/nikhil/BOOT/u-boot.img

Verification: 

Check the u-boot logs as shown below

U-Boot 2021.01-00002-g7f1139c55f

(Apr 26 2023 - 15:38:23 +0530)
SoC: J721S2 SR1.0 GP
Model: Texas Instruments J721S2 EVM
Board: J721S2X-PM1-SOM rev E1
DRAM: 4 GiB
Flash: 0 Bytes
MMC: mmc@4f80000: 0, mmc@4fb0000: 1
In: serial@2880000

Regards,

Nikhil