Differences

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--- chumby [2010/03/22 15:40]
ladyada
+++ chumby [2010/03/23 21:06]
ladyada
@@ Line 99: / Line 99: @@
 stop_control_panel
-./switch_output -l
+/mnt/storage/switch_output -l
 switch_fb.sh 0
 </file>
@@ Line 107: / Line 107: @@
 Also tried the old SDL tests and they're working good now. yay.
+==== Port SIemu ====
+The 'easiest' emulator to port by far is SIemu. Its written in straight-up C, well documented and uses SDL as an underpinning.
+  * Had problem with audio so commented out all the Audio procedures.
+  * Complained about screen size so changes graphics.h to use 320x240 screen
+  * Runs!
+OK much success. Now to fix it so audio works. SDL doesnt seem to know about audio device - perhaps we need to install ALSA lib first?
+==== Install ALSA ====
+We configure/make'd ALSA
+==== Build SDL with OSS ====
+Trying to build SDL with ALSA (unpatched) didnt really work but then  but then we realized that OSS is already in there so many we should just rebuild SDL?
+Built SDL with following flags
+<file>
+./configure --disable-esd --disable-pulseaudio --disable-video-x11 --enable-video-fbcon --disable-alsa
+</file>
+compiled cleanly, ran test/loopwave and it worked! yay!
+==== Rebuild SIemu ====
+unpatched the audio and run it with new SDL that has audio. works! and keyboard works too! kpow kpow.
+much success.
+(note used 'original' SDL not chumbyquake SDL!)
 ==== download stella & ./configure ====
@@ Line 125: / Line 157: @@
 OK, grab an [[http://forum.chumby.com/viewtopic.php?id=4474|updated busybox]] and install it
+Now printf exists, try again
+<file>
+ ./configure --disable-debugger --disable-cheats
+make
+</file>
+but gcc dies :(
+<file>
+g++ -Wp,-MMD,"src/emucore/.deps/PropsSet.d",-MQ,"src/emucore/PropsSet.o",-MP -O2 -Wall -Wno-multichar -Wunused -fno-rtti -fomit-frame-pointer  -DUNIX -DBSPF_UNIX -DHAVE_GETTIMEOFDAY -DHAVE_INTTYPES -DWINDOWED_SUPPORT -DSOUND_SUPPORT -DSNAPSHOT_SUPPORT -DJOYSTICK_SUPPORT  -Isrc/emucore -Isrc/emucore/m6502/src -Isrc/emucore/m6502/src/bspf/src -Isrc/common -Isrc/gui -I/usr/local/include/SDL -D_GNU_SOURCE=1 -D_REENTRANT -Isrc/unix -c src/emucore/PropsSet.cxx -o src/emucore/PropsSet.o
+g++: Internal error: Killed (program cc1plus)
+Please submit a full bug report.
+See <http://gcc.gnu.org/bugs.html> for instructions.
+make: *** [src/emucore/PropsSet.o] Error 1
+</file>
+dmesg says we're out of memory!
+<file>
+[  809.010000] ntpd invoked oom-killer: gfp_mask=0x1201d2, order=0, oomkilladj=0
+[  809.010000] [<c02ff9bc>] (dump_stack+0x0/0x14) from [<c00777f4>] (oom_kill_process+0x5c/0x1d8)
+[  809.020000] [<c0077798>] (oom_kill_process+0x0/0x1d8) from [<c0077f38>] (out_of_memory+0x1dc/0x254)
+[  809.030000]  r8:c2aac000 r7:c0445858 r6:000001be r5:c3dec900 r4:c2a68600
+[  809.040000] [<c0077d5c>] (out_of_memory+0x0/0x254) from [<c007ab98>] (__alloc_pages_internal+0x300/0x3bc)
+[  809.050000] [<c007a898>] (__alloc_pages_internal+0x0/0x3bc) from [<c007cd6c>] (__do_page_cache_readahead+0x118/0x264)
+[  809.060000] [<c007cc54>] (__do_page_cache_readahead+0x0/0x264) from [<c007cf24>] (do_page_cache_readahead+0x6c/0x74)
+[  809.070000] [<c007ceb8>] (do_page_cache_readahead+0x0/0x74) from [<c0075168>] (filemap_fault+0x1d8/0x448)
+[  809.080000]  r7:00000000 r6:c2aac000 r5:00000000 r4:00000000
+[  809.080000] [<c0074f90>] (filemap_fault+0x0/0x448) from [<c0084958>] (__do_fault+0x54/0x488)
+[  809.090000] [<c0084904>] (__do_fault+0x0/0x488) from [<c0085bf0>] (handle_mm_fault+0x2f4/0x7c0)
+[  809.100000] [<c00858fc>] (handle_mm_fault+0x0/0x7c0) from [<c002da64>] (do_page_fault+0xf0/0x238)
+[  809.110000] [<c002d974>] (do_page_fault+0x0/0x238) from [<c002dc34>] (do_translation_fault+0x18/0x80)
+[  809.120000] [<c002dc1c>] (do_translation_fault+0x0/0x80) from [<c0026254>] (do_PrefetchAbort+0x18/0x1c)
+[  809.130000]  r7:00000000 r6:00053790 r5:00052acc r4:ffffffff
+[  809.140000] [<c002623c>] (do_PrefetchAbort+0x0/0x1c) from [<c0026dc0>] (ret_from_exception+0x0/0x10)
+[  809.150000] Exception stack(0xc2aadfb0 to 0xc2aadff8)
+[  809.150000] dfa0:                                     00000000 00052974 000002f6 000002f7
+[  809.160000] dfc0: 00000000 00052acc 00053790 00000000 00053794 0004ecfc 0005234c bed1bb2c
+[  809.170000] dfe0: 00008001 bed1bb00 0002859c 00017608 60000010 ffffffff
+[  809.180000] Mem-info:
+[  809.180000] Normal per-cpu:
+[  809.180000] CPU    0: hi:   18, btch:   3 usd:  10
+[  809.190000] Active_anon:5856 active_file:40 inactive_anon:5862
+[  809.190000]  inactive_file:112 unevictable:0 dirty:0 writeback:0 unstable:0
+[  809.190000]  free:285 slab:767 mapped:26 pagetables:110 bounce:0
+[  809.210000] Normal free:1140kB min:1016kB low:1268kB high:1524kB active_anon:23424kB inactive_anon:23448kB active_file:160kB inactive_file:448kB unevictable:0kB present:65024kB pages_scanned:14 all_unreclaimable? no
+[  809.230000] lowmem_reserve[]: 0 0
+[  809.230000] Normal: 23*4kB 7*8kB 0*16kB 1*32kB 1*64kB 1*128kB 1*256kB 1*512kB 0*1024kB 0*2048kB 0*4096kB = 1140kB
+[  809.240000] 377 total pagecache pages
+[  809.240000] 0 pages in swap cache
+[  809.250000] Swap cache stats: add 0, delete 0, find 0/0
+[  809.250000] Free swap  = 0kB
+[  809.250000] Total swap = 0kB
+[  809.260000] 16384 pages of RAM
+[  809.270000] 423 free pages
+[  809.270000] 2647 reserved pages
+[  809.270000] 630 slab pages
+[  809.270000] 108 pages shared
+[  809.280000] 0 pages swap cached
+[  809.280000] Out of memory: kill process 2683 (g++) score 446 or a child
+[  809.290000] Killed process 2684 (cc1plus)
+</file>
+try..
+<file>
+if [ ! -e /mnt/storage/swap ]
+then
+    echo "Making 256M swapfile"
+    dd if=/dev/zero of=/mnt/storage/swap bs=1M count=256
+    mkswap /mnt/storage/swap
+fi
+swapon /mnt/storage/swap
+</file>
+done and...sucess!
+{{http://farm3.static.flickr.com/2760/4455436625_859aa97392.jpg}}
+good news: you can play ROMs if you specify them on the command line. badnews: the ROM launcher not only doesnt work, but if it tries to run it gives some assert error and then http://ladyada.net/wiki/lib/images/smaller.gifdoesnt 'release' the SDL library (or *something*) and it doesnt really work until reboot. :(
+commented out the Assert in Rect.h and it all works now - this should of course be fixed but hey!
+[[http://lists.libsdl.org/pipermail/sdl-libsdl.org/2006-July/056756.html|The ^C problem is discussed here]] printf!
+==== fix colormap ====
+R and B are swapped in SDL. whyso?
+Uncommented DEBUG_FBCON in SDL, got this
+<file>        xres: 320
+        yres: 240
+        xres_virtual: 320
+        yres_virtual: 240
+        xoffset: 0
+        yoffset: 0
+        bits_per_pixel: 16
+        grayscale: 0
+        nonstd: 0
+        activate: 0
+        height: 240
+        width: 320
+        accel_flags: 0
+        pixclock: 154000
+        left_margin: 5
+        right_margin: 4
+        upper_margin: 3
+        lower_margin: 3
+        hsync_len: 40
+        vsync_len: 2
+        sync: 0
+        vmode: 0
+        red: 5/0
+        green: 6/5
+        blue: 5/11
+        alpha: 0/0
+        </file>
+which is fetched from SDL_fbvideo.c "ioctl(console_fd, FBIOGET_VSCREENINFO, &vinfo)" (in a few places)
+So it seems like the FB driver is reporting the wrong thing
+i guess we could just hack it..?
+Edited SDL_fbvideo.c, line #595 and then #1038
+<file>
+        // BEGIN TERRIBLE MEME HACK
+        uint32_t tempoffset = vinfo.red.offset;
+        vinfo.red.offset = vinfo.blue.offset;
+        vinfo.blue.offset = tempoffset;
+        // END TERRIBLE MEME HACK
+</file>
+but...it works! should probably fix this 'upstream' somehow

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