annotate README.Qtopia @ 1176:dd2a8deeb26d

Date: Mon, 17 Oct 2005 20:09:03 -0400 From: Mark Schreiber <mark7@alumni.cmu.edu> To: ryan@clutteredmind.org Subject: [PATCH]SDL mprotect() crash fix (I'm going to throw this patch your way at the suggestion of #SDL -- for some reason, I had some difficulty sending it to the main list last time, and I go bonkers subscribing to send each email or patch...) Currently, when I run SDL applications as non-root using SDL_VIDEODRIVER=dga, the fbdev fallback mprotect()s read/write the proper size of mmapped /dev/fb0 (7.5MB), but on framebuffer release mprotect()s read-only the range by the entire size of my video memory (128MB), which causes a segfault: #0 0x002a9a27 in ?? () from /lib/libc.so.6 #1 0x04a63eb6 in SDL_XDGAUnmapFramebuffer (screen=3D0) at XF86DGA2.c:978 #2 0x04a63efc in SDL_XDGACloseFramebuffer (dpy=3D0x9d3f008, screen=3D0) at XF86DGA2.c:268 #3 0x04a68b57 in DGA_Available () at SDL_dgavideo.c:98 #4 0x04a53677 in SDL_VideoInit (driver_name=3D0xbfb0bfc7 "dga", flags=3D0) at SDL_video.c:180 #5 0x04a2613f in SDL_InitSubSystem (flags=3D32) at SDL.c:74 #6 0x04a2617c in SDL_Init (flags=3D32) at SDL.c:166 #7 0x08049722 in main (argc=3D1, argv=3D0x0) at testwin.c:32 This is SDL 1.2.8 on Fedora Core 4, radeon driver for a Radeon 9250, xorg-x11-6.8.2-37. I've attached a one-line patch against SDL CVS that updates the size of the framebuffer at framebuffer map time so that the mprotect() on unmap will be the same size. I'm not sure if this is the best approach (i.e. one might want to retain the original value), but it does make my SDL applications work without segfaulting. -- Best of luck, Mark Schreiber
author Ryan C. Gordon <icculus@icculus.org>
date Sat, 19 Nov 2005 18:57:00 +0000
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2 ==============================================================================
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3 Using the Simple DirectMedia Layer with Qtopia/OPIE
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4 ==============================================================================
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6 ==============================================================================
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7 I. Setting up the Qtopia development environment.
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9 This document will not explain how to setup the Qtopia development
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10 environment. That is outside the scope of the document. You can read
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11 more on this subject in this excellent howto:
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13 http://www.zauruszone.com/howtos/linux_compiler_setup_howto.html
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15 ==============================================================================
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16 II. Building the Simple DirectMedia Layer libraries using the arm
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17 cross-compiler
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19 This is somewhat tricky since the name of the compiler binaries
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20 differ from the standard. Also you should disable features not
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21 needed. The command below works for me. Note that it's all one
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22 line. You can also set the NM, LD etc environment variables
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23 separately.
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25 NM=arm-linux-nm LD=arm-linux-ld CC=arm-linux-gcc CXX=arm-linux-g++ RANLIB=arm-linux-ranlib AR=arm-linux-ar ./configure --enable-video-qtopia --disable-video-dummy --disable-video-fbcon --disable-video-dga --disable-arts --disable-esd --disable-alsa --disable-cdrom --disable-video-x11 --disable-nasm --prefix=/opt/Qtopia/sharp/ arm-unknown-linux-gnu
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27 One thing to note is that the above configure will include joystick
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28 support, even though you can't have joysticks on the Zaurus. The
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29 reason for this is to avoid link / compile / runtime errors with
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30 applications that have joystick support.
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32 ==============================================================================
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33 III. Building the Simple DirectMedia Layer test programs:
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35 After installing, making sure the correct sdl-config is in your
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36 path, run configure like this:
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38 NM=arm-linux-nm LD=arm-linux-ld CC=arm-linux-gcc CXX=arm-linux-g++ AR=arm-linux-ar ./configure arm-unknown-linux-gnu
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40 ==============================================================================
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41 IV. Application porting notes
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43 One thing I have noticed is that applications sometimes don't exit
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44 correctly. Their icon remains in the taskbar and they tend to
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45 relaunch themselves automatically. I believe this problem doesn't
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46 occur if you exit your application using the exit() method. However,
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47 if you end main() with 'return 0;' or so, this seems to happen.
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49 Also note that when running in landscape mode - i.e requesting a
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50 window that is HEIGHT pixels wide and WIDTH pixels high, where WIDTH
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51 and HEIGHT normally is 240 and 320 - the image is blitted so that
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52 the hardware buttons are on the left side of the display. This might
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53 not always be desirable but such is the code today.
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56 ==============================================================================
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57 V. Enjoy! :)
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59 If you have a project you'd like me to know about, or want to ask questions,
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60 go ahead and join the SDL developer's mailing list by sending e-mail to:
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62 sdl-request@libsdl.org
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64 and put "subscribe" into the subject of the message. Or alternatively you
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65 can use the web interface:
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67 http://www.libsdl.org/mailman/listinfo/sdl
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69 ==============================================================================
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70 VI. What is supported:
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72 Keyboard (Sharp Zaurus)
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73 Hardware buttons
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74 Stylus input (mouse)
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75 Video. Allows fullscreen both in portrait mode (up to WIDTHxHEIGHT
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76 size window) and in landscape mode (up to HEIGHTxWIDTH).
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78 All other SDL functionality works like a normal Linux system (threads,
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79 audio etc).
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81 --
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82 David Hedbor <david@hedbor.org>
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83 http://david.hedbor.org/ http://eongames.com/
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