Linux for HP Prime V2 (G1)

What's working

• Nand Flash (No ECC)
• I2C Touchscreen (GT9137)
• Keypad
• USB Host 1.1
• USB Devide 2.0
• DRM Support (for X11/SDL)

Build Step

STEP 1

1. Build Bootloader BOOT1.ROM from https://github.com/Repeerc/hpprimev2_linux_loader

2. Build Kernel zImage from https://github.com/Repeerc/Kernel-6.1.35-HP-Prime-V2_G1

3. Build RootFS rootfs.jffs2 from https://github.com/Repeerc/buildroot_hpprimev2

STEP 2

Make LINUX.DAT by using mkimg.sh

STEP 3

Flash BOOT1.ROM and LINUX.DAT.

By using usbtool.exe, connect calculator in Recovery Mode (RESET + Symb) , select Auto update then click Update .

Bugs:

1. NAND Flash Host ECC is not work.

2. Could not reboot or poweroff when enable USB Gadget.

3. Kernel panic when disable USB Gadget.

4. USB HOST Mode not work when enable USB Gadget.

Flash Layout

nand: Hynix H27U2G8F2CTR-BC

nand: 256 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64

2048 Block Total.

Block 0~1: BXCBOOT0.BIN HP BOOT Code (Recovery Mode Included)

Block 2...9: BOOT1.rom

Block 10...x : Kernel zImage

Block 64...y : Rootfs rootfs.jffs2

Block y...2040 : Arbitrary Data (data,swap etc.)

Block 2047: Serial Number and other original system information

When BOOT1.ROM boot, block 0-9 and 2041-2047 will be set to protected in case, so it can be flashed back to the original system.

It seems that usbtool.exe could not access over 64MB flash space, so Kernel + Rootfs were limited in 64MB.

GPIO

USB OTG:

GPH14 = 238 = USBD_PLL ?

GPH13 = 237 = 5V_USB_BOOST_EN

GPF7 = 167 = 5V_USB_OUT_EN

GPF5 = Extern USB Power INSERT ?

GPF6 = OTG ID ?

Touch:

GPF2 = TS_INT

GPF0 = TS_RST

Enable USB Power Output

echo 237 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio237/direction
echo 1 > /sys/class/gpio/gpio237/value

echo 167 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio167/direction
echo 1 > /sys/class/gpio/gpio167/value