Wpa/Design の履歴(No.1)

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• Wpa/Design は削除されています。
  • 1 (2004-10-07 (木) 17:34:45)
  • 2 (2004-10-24 (日) 01:24:25)
  • 3 (2004-10-29 (金) 17:33:30)
  • 4 (2004-10-29 (金) 17:33:30)
  • 5 (2004-11-29 (月) 17:15:30)
  • 6 (2004-11-30 (火) 13:15:58)
  • 7 (2004-12-03 (金) 08:52:39)

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• WpaDevel

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SM501†

• You can dynamically change the Panel/CRT resolution by setting SM501 registers properly, though Linux frame buffer-related information such as vinfo and finfo is no longer reliable.
• You must get necessary information by means of memory mapped registers.
• Video alpha is disabled when video is disabled.
• Alpha is independent of video.
• Panel/CRT timing signal should be turned off during the resolution change to avoid inappropriate timing signals.

SM501 Register Handling†

Registers are handled by means of IOCTL(2). Header files of the target architecture are required to compile a code involving ioctl.

# cp -R linux/include/asm-sh /usr/local/sh4-linux/include/asm

First, open dev/fb0:

fd = open("/dev/fb/0", O_RDWR);

Then, set MMIO address as follows:

ioctl(fd, 0, address)

Read a register value as follows:

int reg32;
ioctl(fd, 1, &reg32)

Finally, write a value to the register as follows:

ioctl(fd, 2, reg32)

Voyager GX Frame Buffer†

SM501 is accessed through seven frame buffers, which are initialized on boot. They contain one video plane, two graphics planes, two alpha planes, and two hardware cursor planes. See SM501_MMCC_Databook pp.(1-12)-(1-13) for details of the video layers. Primary devices with display resolutions of VGA, SVGA, and XGA are considered in this document.

Each node is treated as a character device. See Documentation/fb/framebuffer.txt for details of the frame buffer. Just like MEM(4) device, a frame buffer is opened by OPEN(2):

fd = open("/dev/fb0", O_RDWR);

and mapped into memory by MMAP(2) to access:

char *p = (char *) mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);

See SM501_MMCC_Databook pp.(1-26)-(1-28) for details of the memory map and register space.

SM501 Memory Map†

SM501 Register Values - Common Settings†

SM501 Register Values - VGA†

Bob

SM501 Register Values - SVGA†

Bob

SM501 Register Values - XGA†

Bob

SM501 Register Values - SXGA†

Bob

Voyager GX Frame Buffer - Device Nodes†

     

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