Beginner Question: KallistiOS GL Example Won't Run

[rpk]

I'm a newbie to DC homebrew, and I'm having some difficulty getting the KallistiOS basic GL example to run.

I've been trying https://github.com/ljsebald/KallistiOS/ ... l/basic/gl with no success, regardless of whether it's running in an emulator or on hardware.

My dev environment is Debian Linux (see https://github.com/Drylm/dc-dev), which seems to compile the example just fine:

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root@a1741946a172:/src/kos-docker-test/examples/dreamcast/kgl/basic/gl# make
rm -f gltest.elf romdisk.*
kos-cc  -c gltest.c -o gltest.o
gltest.c: In function 'main':
gltest.c:245:12: warning: format '%d' expects argument of type 'int', but argument 2 has type 'uint32' [-Wformat]
gltest.c:245:12: warning: format '%f' expects argument of type 'double', but argument 3 has type 'int' [-Wformat]
gltest.c:245:12: warning: format '%f' expects argument of type 'double', but argument 4 has type 'float' [-Wformat]
gltest.c:126:13: warning: variable 'texture' set but not used [-Wunused-but-set-variable]
kos-cc  -c pvr-texture.c -o pvr-texture.o
/src/dc/kos/utils/genromfs/genromfs -f romdisk.img -d romdisk -v
0    rom 58661264         [0xffffffff, 0xffffffff] 37777777777, sz     0, at 0x0
1    .                    [0x34      , 0xff6de   ] 0040755, sz     0, at 0x20
1    ..                   [0x34      , 0xff6da   ] 0040755, sz     0, at 0x40     [link to 0x20    ]
1    glass.pvr            [0x34      , 0xff6df   ] 0100755, sz 32800, at 0x60
/src/dc/kos/utils/bin2o/bin2o romdisk.img romdisk romdisk.o
/opt/toolchains/dc/sh-elf/bin/sh-elf-gcc -O2 -fomit-frame-pointer -ml -m4-single-only -ffunction-sections -fdata-sections -I/src/dc/kos/../kos-ports/include -I/src/dc/kos/include -I/src/dc/kos/kernel/arch/dreamcast/include -I/src/dc/kos/addons/include -I/src/dc/kos/../kos-ports/include -D_arch_dreamcast -D_arch_sub_pristine -Wall -g -fno-builtin -fno-strict-aliasing  -ml -m4-single-only -Wl,-Ttext=0x8c010000 -Wl,--gc-sections -T/src/dc/kos/utils/ldscripts/shlelf.xc -nodefaultlibs -L/src/dc/kos/lib/dreamcast -L/src/dc/kos/addons/lib/dreamcast -L/src/dc/kos/../kos-ports/lib -ml -m4-single-only -Wl,-Ttext=0x8c010000 -Wl,--gc-sections -T/src/dc/kos/utils/ldscripts/shlelf.xc -nodefaultlibs -L/src/dc/kos/lib/dreamcast -L/src/dc/kos/addons/lib/dreamcast -L/src/dc/kos/../kos-ports/lib -o gltest.elf  \
        gltest.o pvr-texture.o romdisk.o  -lGL -lpcx -lkosutils -Wl,--start-group -lkallisti -lc -lgcc -Wl,--end-group

This produces gltest.elf, which I convert to a .bin and then scramble:

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sh-elf-objcopy -O binary gltest.elf gltest.bin
/src/dc/kos/utils/scramble/scramble gltest.bin 1ST_READ.BIN

To test on hardware, I use DreamShell 4.0.0 RC 4 with an SD card reader. I copy the .elf, the .bin and the scrambled .bin to the SD card. From the DreamShell file explorer, I try executing each of these. The .elf just makes the Dreamcast reset, and the other two result in a blank screen followed by a lost signal after a few seconds.

To test using emulators, I use BootDreams to generate a .CDI and then depending on the emulator either load the CDI directly or use DaemonTools to mount it as a virtual disk drive. Here are the results:

- DreamEMU loads the scrambled .bin and just renders a black screen (similar to the real hardware, but no way to see logs).
- Demul shows the SEGA license screen then freezes (no way to see logs).
- Chankast shows the SEGA license screen then freezes (no way to see logs).
- reicast does not show the SEGA license screen, and just shows the error: "in cpu_iNimp -> ..\core\hw\sh4\interpr\sh4_opcodes.cpp : 66"
- nulldc shows the SEGA license screen then freezes with the following error:

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    KallistiOS ##version##: Mon Oct 31 23:34:55 UTC 2016
    root@f246d9df54da:/src/dc/kos
    Except in block BE5ECEB | E4765B8
    Except in block BE5ECEB | E4765B8
    Except in block BE5FF11 | E4773F8
    Except in block BE8D0EA | E4948C8
    VREG = 03 ARMRST 01
    Except in block BE8D552 | E495108
    not implemented opcode : 740 : unknown opcode @ 449
    Press Any key to continue

Does anybody have a suggestion of what I could try next?

Edit:

I should add, I've tried a handful of other examples with similar results but am focusing on the GL example because I want to use it to experiment.

Attached are all the generated .elf, .bin and .cdi files.

[BlueCrab]

Try out the 2ndmix example and see if it runs. If it doesn't, then your toolchain is likely the culprit here (and producing bad code).

The unknown opcode in the nulldc logs kinda suggests to me that your toolchain is broken, and if 2ndmix is broken, that would be able to confirm that for me...

[bogglez]

I also think something is wrong with your toolchain.

Can you try this install script instead? It works for everyone including me on Debian

http://dcemulation.org/?title=Compiling_KOS_on_Linux

[rpk]

I just tried the 2ndmix example and it works on nulldc and on hardware.

2ndmix doesn't link with GL or any other libraries, so maybe the toolchain's libraries (kos-ports) weren't set up properly.

I'll try re-building the toolchain using the install script and report back.

Thanks for the help

Edit:

Yep, after re-building the toolchain everything seems to work. Thanks again!