Currently only for feature phones based on SC6530/SC6531 or UMS9117 chipsets.

• THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, USE AT YOUR OWN RISK!

There are other ports that reuse code written for FPDoom:

fpbuild: Duke 3D, Shadow Warrior, Blood
infones: NES emulator
wolf3d: Wolfenstein 3D
snes9x: SNES emulator
chocolate-doom: Heretic, Hexen
gnuboy: GB/GBC emulator

Please read the instructions here for SC6530/SC6531, or here for UMS9117.

1. libc_server: use the host compiler, based on a spd_dump tool, so build it with the same options.
2. pack_reloc: use the host compiler, the tool to extract and compress relocations from an Elf binary.
3. Download the Doom sources, and copy the linuxdoom-1.10 directory as doom_src. Apply the patch: $ patch -d doom_src -p1 -i ../doom.patch.
4. fpdoom: use compiler from Android NDK, build instructions are the same as for custom_fdl from spd_dump.

• You can find prebuilt fpdoom.bin, and host binaries for Windows in Releases.

• Here are additional instructions for the UMS9117 chipset for 4G feature phones.

1. Figure out how to run spd_dump on your feature phone.
2. Create a working directory workdir and place the Doom resource file here, for example doom1.wad from the shareware version of Doom 1.
3. Put these commands in a script, run it and then connect your phone:

$ ./spd_dump fdl nor_fdl1.bin 0x40004000 fdl fpdoom.bin ram
$ cd workdir && ../libc_server -- --bright 50 --rotate 3 doom

• --bright X is the phone screen brightness (X = 0..100).
• --rotate S[,K] is the screen/keypad rotation in 90 degress units (-1 or 3 = -90, 1 = +90, etc.) All feature phone LCDs I've seen (except GC9308) are vertical, if you have a phone with a horizontal display - that means it's a vertical LCD placed horizontally, so you need to use different S and K values.
• You can add extra options for Doom, for example doom -timedemo demo1.

1. Message !!! unknown LCD. I can add support for this LCD if you send me a firmware dump from your phone.
2. Message !!! keymap not found, means the firmware scan algorithm can't find the keymap, so you can't use the keypad, only watch replays. I can extract the keymap if you send me a firmware dump.
3. Message Error: W_InitFiles: no files found, means that no .wad files were found. On Linux files must be named in lower case.

• Nokia phones (SC6531): add end_data 0 command for spd_dump, before fdl commands
• Nokia phones (UMS9117): add t117_exec_dist 0x314d command for spd_dump, before fdl commands
• Vertex M115: use --lcd 0x807c89f0
• Nobby 170B: use --mac 0xa8 without --rotate
• Smart Watch DZ09: use --spi 0 --lcd 0x80009307, no controls - you can only watch replays, no boot key - use boot cable
• BQ 3586 Tank Max: use --bl_gpio 19 for backlight to work properly
• YX Q5 Kids Camera: use --mac 0xa8 without --rotate
• Alcatel 2019G: dial key is mapped to left soft key
• Texet TM-122, Texet TM-130, BQ 1800L One: use --lcd 0x80009106, to fix LCD refresh artifacts
• Texet TM-B307: use --gpio_init, to prevent the flashlight from turning on
• Texet TM-B316: use --lcd 0x8083760f --rotate 1,0
• Texet TM-B323, Texet TM-B208, CHAKEYAKE T190: use --rotate 3,0 --keyflags 1
• Texet TM-B323: very rare resolution, not the best support for it
• Tokky FP10, Fontel FP100: use --lcd 0x7567
• Joy's S16, Vertex M114, Digma Linx A106: use --lcd 0x1230
• Joy's S19: use --lcd 0x7565
• LONG-CZ J9: use --lcd 0x1306
• Prestigio Wize J1: use --lcd 0x80009106, 0 and # keys not present in the keymap and implemented differently
• Texet TM-B322: use --lcd 0x7567, dial key is mapped to left soft key
• Jinga Simple F170: use --mac 0xd8
• Fontel FP200: the same model name is reused for a phone on a completely different hardware, which has a type-C connector, USB device code 1e04:0920, this is an RDA chip. The supported device on the SC6531 chip has a micro-USB connector.
• Inoi 284 Flip: use --rotate 1,3 --gpio_data 0x28,-0x6d,-0x67,0x68 to play on the front screen, or --gpio_data -0x28,0x6d,0x67,-0x68 to play on the back screen.
• i-TOP P100: use --bl_extra 9,0x20,0
• Nokia 110 4G (TA-1543): use --bl_extra 0,0xe,0

• monochrome LCDs: can't be detected, support varies across ports and LCDs, better for screens with ST7567A

• D-pad and keys 1-9 are rotated with the --rotate option (with screen or separately).
• For phones without D-pad Center key (Nobby 170B) - up/down keys are used for fire.
• If you don't like the controls - you can change it in keytrn.c.
• Combinations with the power button are for the Children's Camera, which has only six keys. Don't hold down the power button for too long (7 seconds), as this may trigger the device to power off.

• Use --charger 2 option to libc_server so that the battery can be removed for the SC6531 after the game is loaded, the game will continue to run on USB power.