NP6800 Emulation

NP6800-specific steps.

Create initial system image

Download upgrade.bin from official website:
https://downloads.youxuepai.com/source/list.shtml#118&name=NP6800/NP6800+

See: qemu/create_system_image.sh

#!/bin/bash -x
src=$1 #upgrade.bin
pkg=upgrade.pkg
image=image.bin
qcow2=image.qcow2

# Extract data sections from upgrade.bin
[ -f $pkg ] || ./mkpkg --type=np1000 --extract $src $pkg

# Create NP6800 system image
# Ignore errors as it does not support ext3 file system format yet
rm -f $image
./create_system_image.py -s $((8*1024*1024*1024)) $pkg $image

# (Optional) Convert NAND image to qcow2 format
qemu-img convert -f raw -O qcow2 $image $qcow2

Create qcow2 overlay files

Optionally create qcow2 overlay files, as snapshots, like this:

qemu-img create -f qcow2 -F qcow2 -b image.qcow2 image_overlay.qcow2

Start QEMU

system_image=image_overlay.qcow2
mmc_image=mmc_overlay.qcow2

./qemu-system-mipsel \
    -M noah_np6800 -cpu JZ4750 \
    -d guest_errors,unimp \
    -bios jz4750.bin \
    -parallel null \
    -serial none \
    -serial none \
    -serial none \
    -serial mon:stdio \
    -spice port=5910,disable-ticketing=on \
    -display none \
    -audio spice \
    \
    -blockdev driver=file,node-name=mmc0_qcow2,filename=$system_image \
    -blockdev qcow2,node-name=mmc0,file=mmc0_qcow2 \
    -device sd-card,spec_version=3,drive=mmc0,bus=sd-bus-msc0 \
    \
    -blockdev driver=file,node-name=mmc1_qcow2,filename=$mmc_image \
    -blockdev qcow2,node-name=mmc1,file=mmc1_qcow2 \
    -device sd-card,spec_version=3,drive=mmc1,bus=sd-bus-msc1

Force PC17 to 0 in qemu/hw/mips/noah_np6800.c to flash firmware.