SPRAD09A December   2021  – July 2022 DRA821U , DRA821U-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1Hardware and Software Required Stuff
  4. 2DRA821U Boot Mode With Fast Boot Method
  5. 3Detailed Steps
    1. 3.1 Step1: Patch and Build/Copy the u-boot
    2. 3.2 Step2: Optimizations by Switching to xSPI Boot: Copy Bootloaders to xSPI
    3. 3.3 Step 3: Optimize the DTSI by Disabling Nodes not Mandatory for Linux Boot
    4. 3.4 Step 4: Create Bootable SD Card, Switch to TinyFS
    5. 3.5 Step 5: Switch to eMMC Filesystem
    6. 3.6 Step 6: Optimizations With Bootargs
    7. 3.7 Step 7: Hijack the init
  6. 4Debug Commands
    1. 4.1 SF Probe
    2. 4.2 mmcblk
    3. 4.3 How to Check Mounted Devices?
    4. 4.4 How to Check Your Partitions?
    5. 4.5 How to Restore Your Boot Setting?
  7. 5Fast Boot Result Review
  8. 6References
  9. 7Revision History

3.3 Step 3: Optimize the DTSI by Disabling Nodes not Mandatory for Linux Boot

Boot switch setting:

No need to change the boot switches in this step.

Insert the SD card to Host PC

Patches:

0001-arch-arm64-boot-dts-ti-k3-j7200-Optimize-DT-for-earl.patch

This patch is here: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1105700/dra821u-application-note-how-to-linux-fast-boot-on-dra821u-putting-the-required-2-patches-here

Commands: (Do this on the ubuntu, not the EVM)

gedit $PSDKLA/Rules.make

Change this line: DESTDIR=/media/$USER/rootfs

Insert the SD card to Host P

cd $PSDKLA/board-support/linux-5.10.41+gitAUTOINC+4c2eade9f7-g4c2eade9f7/
git am 0001-arch-arm64-boot-dts-ti-k3-j7200-Optimize-DT-for-earl.patch
cd ../..
make linux
sudo make linux_install