updating h700 device dtb

updating h700 device dtb.txt

| HOST for me is macOS
| DOCKER for me a debian:bookworm-slim docker image with device-tree-compiler installed (among other things) 
| these offsets and values are specific to the 40xxH
| /dev/rdisk4 was the (raw) SD mount point at time of testing
|	  double check DiskUtility.app and update path accordingly
| boot_package offsets from https://github.com/knulli-cfw/knulli.org/blob/main/docs/guides/h700-firmware-extract.md

HOST: extract the boot_package.img and dupe

	sudo dd if=/dev/rdisk4 of=boot_package.img bs=1024 skip=16400 count=20464
	cp boot_package.img boot_package-mod.img

HOST: use binwalk to get the offset and size (there will be two, you want the second one)

	binwalk boot_package.img | grep Flattened

	1161216       0x11B800        Flattened device tree, size: 139999 bytes, version: 17

HOST: use dd to extract

	dd if=boot_package.img of=2.dtb bs=1 skip=1161216 count=139999

DOCKER: decompile

	dtc -I dtb -O dts -o 2.dts 2.dtb

HOST: edit the dts

	try to change lcd_ht,lcd_vt from 770,522 (59.71Hz) to 768,521 (59.98Hz)
	
	(lcd_dclk_freq*100000) / (lcd_ht * lcd_vt) = fps
	
	then add the sum of the changes made to lcd_ht and lcd_vt to lcd_backlight (from 50 to 53)
	(to preserve a presumed boot_package checksum, otherwise the device won't boot)
	
DOCKER: recompile and dupe the original for manual edits

	dtc -I dts -O dtb -o 2-mod.dtb 2.dts
	cp 2.dtb 2-man.dtb
	
	I think stock might require this be an exact size so I ended up creating a 2-man.dtb
	by copying and manually modifying by diffing 2.dtb and 2-mod.dtb in hexfiend 
	and just manually overwriting the three modified bytes

HOST: reinject with dd (copied boot_package.img to boot_package-mod.img first)

	dd if=2-man.dtb of=boot_package-mod.img bs=1 seek=1161216 conv=notrunc

HOST: then flash to the existing sdcard with

	diskutil unmountDisk /dev/disk4
	sudo dd if=boot_package-mod.img of=/dev/rdisk4 bs=1024 seek=16400

---

DEVICE: reading dtb values

	cd /sys/firmware/devicetree/base/soc@03000000/lcd0@01c0c000
	xxd lcd_ht
	xxd lcd_vt