NP2300+ Emulation

NP2300+-specific steps.

Create system image

Download NP2300+(INAND V1.02).* from NP2300+TF卡修复升级程序V1.02.rar from official website:
https://downloads.youxuepai.com/source/list.shtml#117&name=NP2300+

#!/bin/bash -ex
in="NP2300+(INAND V1.02).idx"
# Create NP7000 system image
./dump_mop_image.py -s $((8*1024*1024*1024)) "$in" .
# (Optional) Convert NAND image to qcow2 format
qemu-img convert -f raw -O qcow2 image.bin 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

Keyboard mapping file

The gpio-matrix-keypad device includes a very basic config parser for mapping keyboard input to device matrix keyboard.

Key names can be found in qemu/qapi/ui.json,
Or use --trace gpio_matrix_keypad_event QEMU trace log option to see key events.

Create a yaml mapping file named keymap.yaml:

---
keymap:
  pin-0: "home"   # HOME
  pin-1: "up"     # UP
  pin-2: "down"   # DOWN
  pin-3: "left"   # LEFT
  pin-4: "right"  # RIGHT
  pin-5: "ret"    # ENTER
  pin-6: "esc"    # ESC
  pin-7: "pgup"   # VOL+
  pin-8: "pgdn"   # VOL-
  pin-9: "f12"    # POWER

  pin-28: "1"     # charging not done
  pin-29: "2"     # charger & USB not connected
  pin-30: "3"     # MSC1 SD card removed
  pin-31: "4"     # BOOT_SEL1: 0: MSC0, 1: NAND

Start QEMU

system_image=image_overlay.qcow2
mmc_image=mmc_overlay.qcow2

./qemu-system-mipsel \
    -M noah_np2300p -cpu JZ4755 \
    -d guest_errors,unimp \
    -bios jz4750.bin \
    -parallel null \
    -serial none \
    -serial tcp:localhost:7646 \
    -global gpio-matrix-keypad.map-file=keymap.yaml \
    -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

Note that we are using jz4750.bin bootrom, although the SoC is JZ4755.
The jz4755.bin bootrom does not support booting from MSC0 yet.

Gallery

TODO