Subversion Repositories planix.SVN

this is a plan 9 port to the Trimslice with tegra2 soc: dual-core,
dual-issue 1GHz Cortex-A9 system (v7a arch).

dram is 1GB at 0.
linux believes that u-boot runs in the bottom 4MB.
the l2 cache is a non-architectural bag nailed on the side.
mp arm systems have a generic interrupt controller; this one is gic v1(!).
vfp 3 floating-point is present.

section numbers (§) are in the tegra 2 tech. ref. man.
for a minimal cpu server, need these devices to work:
        clock signals §5 (leave to u-boot),
        pad mux + gpio crap §8, §11 and §18 (leave to u-boot),
☑     1 cpu §13,
☑     uart (16[45]50) §22,
☑     gic (gic.v1.pdf),
☑     clock §6—7,
☑     ether8169 via pcie §31.
then add these:
☑     2nd cpu (cortex.a9.mpcore.pdf),
☑     l2 cache (l2cache.pl310.pdf, errata),
☑     fpu (cortex.a9.fp.pdf),
☑     user profiling,
        kprof,
        in-line 64-bit arithmetic,
eventually might want:
        usb (e.g., for sata) §26,
        nor flash §17,
        video §29,
and the really horrid ones:
        nand flash §16,
        mmc §25.

physical memory map

0                1GB     ram

40000000        256K    iram (audio/video memory)
50000000                cortex-a9 cpu regs, periphbase, intr distrib, memsel,
                        l2 cache
54000000                graphics regs
58000000                gart (graphics window)
60000000        256MB   ppsb bus dev regs, including semas, intr ctlr, dma,
                        arm7 cache, gpio, except. vects
70000000        256MB   apc bus regs, including uarts, nand, nor, spi, rtc

80000000        1GB     ahb extern mem, pcie for cpu only
90000000-97ffffff       pcie 0 mem(?)
a0000000-a7ffffff       pcie 0 prefetch mem, includes rtl8111dl ether(?)
a0020000                ether region 4
a0024000                ether region 2

c0000000        256MB   ahb bus                 virtual b0000000
c3000000-c80007ff 81MB  ide, usb, sata, mmc
d0000000        256MB   nor flash               virtual 40000000
f000f000        4K      mmu tlb
fff00000        48K     irom boot code
ffff0000        64K     high vectors

use 0xc0000000 as KZERO.