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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /Documentation/sgi-visws.txt
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
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1
2The SGI Visual Workstations (models 320 and 540) are based around
3the Cobalt, Lithium, and Arsenic ASICs. The Cobalt ASIC is the
4main system ASIC which interfaces the 1-4 IA32 cpus, the memory
5system, and the I/O system in the Lithium ASIC. The Cobalt ASIC
6also contains the 3D gfx rendering engine which renders to main
7system memory -- part of which is used as the frame buffer which
8is DMA'ed to a video connector using the Arsenic ASIC. A PIIX4
9chip and NS87307 are used to provide legacy device support (IDE,
10serial, floppy, and parallel).
11
12The Visual Workstation chipset largely conforms to the PC architecture
13with some notable exceptions such as interrupt handling.