[RFC PATCH v3 01/27] target/loongarch: Update README

[Xiaojuan Yang]

Mainly introduce how to run the softmmu

Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
---
 target/loongarch/README | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/target/loongarch/README b/target/loongarch/README
index 09f809cf80..49c1f1575a 100644
--- a/target/loongarch/README
+++ b/target/loongarch/README
@@ -71,6 +71,26 @@
       ./qemu-loongarch64  /opt/clfs/usr/bin/pwd
       ...
 
+- Softmmu emulation
+
+  Add support softmmu emulation support in the following series patches.
+  Mainly emulate a virt 3A5000 board that is not exactly the same as the host.
+  Kernel code is on the github and the uefi code will be opened in the near 
future.
+  All required binaries can get from github for test.
+
+  1.Download kernel and the cross-tools.(vmlinux)
+
+      https://github.com/loongson/linux/tree/loongarch-next
+      
https://github.com/loongson/build-tools/releases/latest/download/loongarch64-clfs-20210831-cross-tools.tar.xz
+
+  2.Download the clfs-system and make a ramdisk with busybox.(ramdisk)
+
+  3.Run with command,eg:
+
+   ./build/qemu-system-loongarch64 -m 4G -smp 4 --cpu Loongson-3A5000 
--machine loongson3-ls7a -kernel ./vmlinux -initrd ./ramdisk  -append 
"root=/dev/ram console=ttyS0,115200 rdinit=/sbin/init loglevel=8" -monitor 
tcp::4000,server,nowait -nographic
+
+The vmlinux, ramdisk and uefi binary loongarch_bios.bin can get from :
+    git clone https://github.com/yangxiaojuan-loongson/qemu-binary
 
 - Note.
   We can get the latest LoongArch documents or LoongArch tools at 
https://github.com/loongson/
-- 
2.27.0