* 9nextstation
@ 1995-08-31 1:36 geoffc
0 siblings, 0 replies; only message in thread
From: geoffc @ 1995-08-31 1:36 UTC (permalink / raw)
today i got plan 9 to run on a nextstation with old (2.1) boot
roms. the other nextstations around here have 2.2 roms.
n.b.: rob tells me that plan 9 on nextstations needs at least 16mb.
these diffs are relative to the cd rom.
geoff collyer
diff ./io.h /sys/src/9/next/io.h
19a20
> #define VIDEOOUTLIMIT IO(0x02004184)
diff ./main.c /sys/src/9/next/main.c
66a67,76
>
> /*
> * the boot rom is supposed to set all the video out registers sensibly,
> * and indeed the v2.2 boot rom does so. The v2.1 boot rom does not,
> * and the video limit register contains a very large garbage number;
> * thus we need to set the limit register here in order to get `clock'
> * interrupts near each frame end to run the scheduler. The value 0xea
> * is what the v2.2 boot rom sets the limit register to.
> */
> *(ulong*)VIDEOOUTLIMIT = 0xea;
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