164 lines
6.0 KiB
Plaintext
164 lines
6.0 KiB
Plaintext
<$Revision: 1.4 $>
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This is to be a summary of the status of code, its problems,
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and the directions it should and take in the future.
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The major bugs:
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the clock interrupts are coming at a rate 100 times greater than
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they are programmed for. When the clock interrupts are going
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at this rate, and the clock interrupt is calling hardclock(),
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it makes no progress beyond enablertclock(). this bug is
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priority one. Until this works, we won't be able to get
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nfsdiskless operation to work at all.
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trap code. the assembly part of the trap handling code is
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not currently being used, because at until its time for the
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fork(), it doesn't do much and the sun3 monitor diagnostics
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are better than anything in the trap code. (note: buserr must
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get special delay code for timeouts, and the memory error register
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needs to be mapped (i think the mapping is commented out in
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obio_internal_configure())
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This code has been hosted under SunOs. Its not clear whether
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the sun boot blocks can load kernels linked with our a.out, etc.
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This is a question that *must* be answered.
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I'm not running a current tree, because i can't afford a slip
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connection at the moment.
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there is an insane hack in 'swapnfs', and the
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TIMESINK.nfsdiskless stuff because we don't have any way of
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getting nfsdiskless information yet.
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my tree doesn't have the non-contig phys memory changes. This port
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needs them on the 3/50 or maybe its the 3/60 where the framebuffer
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is plop at 1mb in phys mem. The only reason this hasn't been a problem
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is that the kernel is still *relatively* small.
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Note:
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the only ok config file is 'TIMESINK'. the others need to be updated.
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Core code: (i.e sun3/sun3, sun3/include)
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----------
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Random:
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need to compute idprom checksum (was lazy)
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need support for 'eeprom', including a non-sun copyrighted header
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better integration with the eeprom on issues like consoles, and
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generic boot support
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all the FPUCOPROC support is untested and from the hp300 port.
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It needs to be better integrated and triggered by something other
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than this awful define. Also need FPU emulation code.
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msgbuf should be allocated later, using the pmap stuff,
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same with high_segment crud. see the dvma_alloc code for
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an example of how much cleaner this is.
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ddb support
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kgdb support
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kernel still isn't protected.
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locore.s got split into many pieces, partially for organizational
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purposes, partially because i hate 40k masses of assembly code. The
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idea was to break the code up along machine
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dependent/machine-independent lines. Any machine-independent code
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could be shared with other 68k-based implementations as common code.
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I haven't analyzed this breakdown yet. There were some surprises
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in both directions. Don't consider this the final layout, but
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also don't make it the first priority to fix. I'm interested
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in getting this damn thing to work first :)
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pmap:
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the pmap module is the most complicated piece of code in the
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port, and it has absolutely no debugging support. This was a goof.
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pmap module should be 3-level cache, instead of 2.
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fix code so that the early pmap clean stuff isn't necessary.
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better support for running in bootstrap mode,
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i.e before pv_ tables can be allocated.
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Device driver support:
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----------------------
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Missing functionality:
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OBIO probe support
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match/probe re-computation of default parameters
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OBIO space collision avoidance
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Missing busses:
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VME - absolute no support, i just don't know shit about it.
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Missing drivers:
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zs - for the Zilog 8530 that run the mouse, keyboard, and serial ports.
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Sun3s have two 8530s with 2 channels apiece. Instead of hardwiring
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the connection between particular chips/channels and function, I'd like
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the zs driver to be implemented as a bus supporting n-clients. In this
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model, the mouse, and keyboard drivers are just optional clients of the
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zs driver, and can be torched if you want to hack up a quick cable
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and use them as serial ports. This is also the right way to deal
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with the complexities of a zs channels being used for things like
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'kgdb', and synchronous operation. This design does make the
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core zs driver more complicated, but i think it will be worth it.
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scsi - I want to use torek's scsi system, if only to find out whether it is
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any good. Or we could use Julien's lump of crud. Either way
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we need:
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support for the ncr 5380, possibly based on the mach3 5380 code.
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support for the amd 9516 dma chip
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kbd - needs to support sun's kbd interface including support for the
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3 different keyboard modes, basically whatever is neccessary for X.
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mouse - needs to support sun's mouse interface down to the letter so that
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X works out of the box
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bwtwo - this should be minimal, and is needed first
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cg2, cg4, cg6, etc. - unknown complexity
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fb - also minimal. Basically a virtual driver for reaching the frame buffers.
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fpa - not the 68881, but sun's proprietary thing. I don't want to
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support this thing as it requires downloaded microcode which
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isn't freely available
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Problems with existing drivers:
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lance - current driver is based on the hp300 code. Torek's version
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is also based on the hp300 code but possibly a later revision.
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Should be analyzed further to determine its quality. Only known
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problem with existing code so far is the non-configurable number of
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receive/send buffers. This is a result of a hp300 hardware limitation,
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that does not exist in the sun3 or sun4.
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Boot code:
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----------
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Currently requires sun bootblks, secondary boot support, etc. Needs
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to be replaced with attention paid to NetBSD's as yet un-developed
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NFS diskless architecture.
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Some code exists from Sprite for using PROM's exported drivers for
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bootstrapping. This would have to be re-written and added to some
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small NFS code perhaps from LBL's bootbootp stuff, etc. Lots of work
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to be done here.
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Compatibility:
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--------------
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Need to integrate Torek's sunos compatibility code in if possible, and
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remove the HPUX crud.
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