[FAQ] TDA4VM: On 7.3/8.0 SDK how to reduce DDR speed to 3733 MTS

SDK 7.3: Changing the frequency to 3733 MTS

DDR frequency increased to 4266MTS in 7.3SDK.

Please find the zip below with DDR frequency reduced to 3733 MTS. Unzip the 4 images & try to boot.

8358.3-ddr-reduced-freq-3733.zip

FYI: Only If you want to recreate the above files in your setup Please do the following on 7.3SDK else above zip files validation is good enough.

cd $PSDKLA_PATH/board-support/u-boot-2020.01+gitAUTOINC+2781231a33-g2781231a3
git revert eea73800730b3d9125f5c12a629db2f88e566b71
cd ../..
make u-boot
cp board-support/u-boot_build/a72/tispl.bin board-support/u-boot_build/a72/u-boot.img board-support/u-boot_build/r5/tiboot3.bin /media/$user/boot
sync

Steps to verify the frequency change:

Boot to kernel. Use the k3conf tool to check the DDR frequency: Below command:

k3conf dump clocks 47

|--------------------------------------------------------------------------------|
| VERSION INFO |
|--------------------------------------------------------------------------------|
|---------------------------------------------------------------------------------------|
| Device ID | Clock ID | Clock Name | Status | Clock Frequency |
|---------------------------------------------------------------------------------------|
| 47 | 0 | DEV_DDR0_DDRSS_VBUS_CLK | CLK_STATE_READY | 1000000000 |
| 47 | 1 | DEV_DDR0_PLL_CTRL_CLK | CLK_STATE_READY | 500000000 |
| 47 | 2 | DEV_DDR0_DDRSS_DDR_PLL_CLK | CLK_STATE_READY | 933000000 |

The Actual DDR speed is DEV_DDR0_DDRSS_DDR_PLL_CLK  * 4. So if you have used the attached binaries you should see
933 * 4 = 3733 MTS.

SDK 8.0: Changing the frequency to 3733 MTS

DDR frequency increased to 4266MTS in 7.3SDK.

Please find the zip below with DDR frequency reduced to 3733 MTS. Unzip the 4 images & try to boot.

sdk8-0-3733-ddr.zip

FYI: Only If you want to recreate the above files in your setup Please do the following on 8.0SDK else above zip files validation is good enough.

Please revert 3 commits:

cd $PSDKLA_PATH/board-support/u-boot-2021.01+gitAUTOINC+53e79d0e89-g53e79d0e89
git revert 2f21e5b897755334d9a4f2aaacd6945dd2f99cd4
git revert de779d94c7f2b66f0506f44bfc78c2a3e000ecc5
git revert 88f9f21f7ad78a80d1375ee2e7b71ac3ab261b6c
cd ../..
make u-boot
cp board-support/u-boot_build/a72/tispl.bin board-support/u-boot_build/a72/u-boot.img board-support/u-boot_build/r5/tiboot3.bin /media/$user/boot
sync

Best Regards,
Keerthy