From b5987117a40aad82d56e2b07b512fe92a11bbbd9 Mon Sep 17 00:00:00 2001
From: Arturs Artamonovs <dos21h@gmail.com>
Date: Fri, 22 Dec 2023 10:10:53 +0000
Subject: Update Qemu ARM64 notes

---
 md/writeup/qemu_arm64.md | 38 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 36 insertions(+), 2 deletions(-)

(limited to 'md')

diff --git a/md/writeup/qemu_arm64.md b/md/writeup/qemu_arm64.md
index 244319c..79f8819 100644
--- a/md/writeup/qemu_arm64.md
+++ b/md/writeup/qemu_arm64.md
@@ -67,11 +67,44 @@ qemu-system-aarch64 -M virt -m 1024 -cpu cortex-a53 \
 
 ## Run virt 
 
-Qemu contains configuration to run non existent machine called virt that suppose to be run with virtual machines. 
+Qemu contains configuration to run physicaly non existant ARM64 board called virt that suppose to be run with virtual machines and contains generic configuration.
+
+Basic examples how to boot into the busy box shell is. Build busy boxwith mount,ash,exec and echo.
+Create init script that will set the pathes and create some dev,proc and sys mount points and switch
+to busybox shell. 
+
+```bash
+#!/sh
+/busybox echo "Boom" > /dev/kmsg
+export PATH=/sbin:/usr/sbin:/bin:/usr/bin:/
+/busybox mount -t proc none /proc
+/busybox mount -t sysfs none /sys
+/buysbox mount -t devtmpfs -o nosuid,mode=0755 udev /dev
+/busybox mount /dev/pts
+/busybox mount -t devpts -o noexec,nosuid,gid=5,mode=0620 devpts /dev/pts || true
+exec /busybox sh
+```
+
+Create initrd files with init file and busybox utilities
+
+```bash
+find . | cpio -o -c -R root:root | gzip -9 > ../initrd-arm64.img
+```
+
+Boot into the just created initrd
 
 ```bash
+qemu-system-aarch64 \
+    -machine virt -m 1024M -cpu cortex-a53  \
+    -kernel bootfs-arm64/Image.gz \
+    -initrd initrd-out.gz \
+    -append "root=/dev/ram0  console=ttyAMA0 debug " \
+    -nographic
 ```
 
+
+
+
 ## Under ArchLinux
 
 Install all qemu packages with 
@@ -99,4 +132,5 @@ pacman -S qemu-full
 12. [https://wiki.archlinux.org/title/mkinitcpio](https://wiki.archlinux.org/title/mkinitcpio)  
 13. https://www.ibm.com/docs/en/zos/2.4.0?topic=codes-exit-status-usrsbininit
 14. https://access.redhat.com/solutions/24029  
-15. [http://phwl.org/2022/qemu-aarch64-debian/](http://phwl.org/2022/qemu-aarch64-debian/)
\ No newline at end of file
+15. [http://phwl.org/2022/qemu-aarch64-debian/](http://phwl.org/2022/qemu-aarch64-debian/)
+16. [http://git.main.lv/cgit.cgi/os201.git/tree/create_installroot](http://git.main.lv/cgit.cgi/os201.git/tree/create_installroot)  
\ No newline at end of file
-- 
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