feat: add u-boot load boot.src guide

Author: initdc

.gitignore

@@ -4,5 +4,11 @@
 *.efi
 *.EFI
 
+boot.scr
+dtb
+Image
+
 /test
-/rootfs
+/rootfs
+/u-boot
+/edk2

Makefile

@@ -61,7 +61,16 @@ uefi-shell:
 	qemu-system-aarch64 -m 1024 -smp 2 -cpu cortex-a57 -M virt -nographic \
 	-drive if=pflash,format=raw,readonly=on,file=QEMU_EFI_64M.fd \
 	-drive if=pflash,format=raw,file=varstore.img \
-	-drive file=fat:rw:test
+	-drive file=fat:rw:edk2
+
+uboot-env:
+	qemu-system-aarch64 -m 1024 -smp 2 -cpu cortex-a57 -M virt -nographic \
+	-bios u-boot.bin \
+ 	-device loader,file=u-boot/boot.scr,addr=0x40200000 \
+	-drive file=fat:rw:u-boot \
+	-drive if=none,file=$(shell find openwrt-*-squashfs-rootfs.img),id=hd0 \
+	-device virtio-blk-device,drive=hd0 \
+	$(EXTRA_ARG)
 
 uboot-efi:
 	qemu-system-aarch64 -m 1024 -smp 2 -cpu cortex-a57 -M virt -nographic \
@@ -72,3 +81,7 @@ uboot-efi:
 
 parted-list:
 	parted $(ARGS) unit MiB print
+
+boot.src:
+	mkimage -A arm64 -O linux -T script -C none \
+	-d u-boot/boot.txt u-boot/boot.scr

README.md

@@ -19,7 +19,7 @@ pkill -f qemu-system-aarch64
 - Ubuntu 26.04
 
   ```
-  sudo apt install qemu-system-arm make
+  sudo apt install qemu-system-arm make u-boot-tools
   ```
 - OpenWrt files https://downloads.openwrt.org/releases/24.10.5/targets/armsr/armv8/
 
@@ -45,12 +45,42 @@ pkill -f qemu-system-aarch64
 - UEFI Shell https://github.com/pbatard/UEFI-Shell
 
   ```
-  mkdir -p test/EFI/BOOT
-  cp shellaa64.efi test/EFI/BOOT/BOOTAA64.EFI
+  mkdir -p edk2/EFI/BOOT
+  cp shellaa64.efi edk2/EFI/BOOT/BOOTAA64.EFI
 
   make uefi-shell
   ```
 
+- U-Boot boot.src (as a disk partition)
+
+  ```sh
+  mkdir -p u-boot/boot
+  cp openwrt-24.10.5-armsr-armv8-generic-kernel.bin u-boot/boot/Image
+  touch u-boot/boot.txt
+  ```
+
+  edit `u-boot/boot.txt`
+  ```sh
+  fatload virtio 1 ${kernel_addr_r} /boot/Image
+  setenv bootargs root=fe00
+  booti ${kernel_addr_r} - ${fdtcontroladdr}
+
+  echo "Boot failed!"
+  ```
+
+  ```sh
+  make boot.src
+  make uboot-env
+
+  # enter u-boot
+  source ${scriptaddr}
+  ```
+
+  U-Boot `.CONFIG`
+  ```sh
+  CONFIG_BOOTCOMMAND="source ${scriptaddr}"
+  ```
+
 ### Guide
 
 https://openwrt.org/docs/guide-user/virtualization/qemu