Subject: Re: am79900.c assumes little-endian processor?
To: None <email@example.com>
From: Matthias Drochner <M.Drochner@fz-juelich.de>
Date: 11/09/1999 20:45:43
> Oddly, ISTR our original ILACC driver was the result of someone
> experimenting with a VME 680x0 board with an ILACC on it, so I would
> actually expect it worked on big-endian systems once.
Experimenting??? - what??? - this is PRODUCTION!
(boot output appended)
To be honest - I haven't updated this port for a while,
it was more a proof-of-concept because the TCP performance
of the OS-9 running on the board was so miserable.
It's a two-processor board actually, so once we have some
more SMP support it could turn into a number-cruncher...
> I am not at
> all surprised that it doesn't now, however.
As you see, it still worked in may. There were no changes
to the lance stuff afaik, so I'm still optimistic.
> If you're going to fix this you might want to finish splitting out
> the 79900 driver so it can DMA into mbufs instead of the abominable
> dma-and-copy approach the 7990 code has to take because of the way the
> onboard LANCEs on things like the pmax work.
You can't always assume that a 32-bit chip can DMA to the main memory.
The ILACC on my board at least has a private dual-port RAM.
As I see it now: The newest PCnet chips even have MII support. We
probably won't burden all ports using old 7990 chips with an "mii"
attribute. I'd say at this point we should make a more or less separate
driver for the "high-end" stuff which understands DMA and MII.
Otherwise the existing lance code would turn into a mess.
WARNING: Timesharing HALTED.
(type 'G' to resume.)
Dn: B0BD0667 1BADD00D 2008131E 2008233A 00000000 0000009E 00001060 00000000
An: 21F6F7B2 200268E6 20082332 2008232A 20082326 200822B4 20089300 21F6F342
SR: 2700 (--S--7--------) SSP: 21F6F342 USP: 20082260
PC: 2001641E - 46DF move.w (a7)+,sr
debug: g 20100400
[ no symbols available ]
Stopped in at 0x840f6: unlk a6
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NetBSD 1.4B (GENERIC.native) #24: Fri May 14 16:19:48 MEST 1999
delay constant: 30
real mem = 33554432
avail mem = 28192768
using 819 buffers containing 3354624 bytes of memory
le0 at mainbus0: address 00:80:a2:00:31:b1
le0: 32 receive buffers, 8 transmit buffers
zsc0 at mainbus0: Zilog 8530 SCC
zstty0 at zsc0 channel 0 (console)
zstty1 at zsc0 channel 1
psl: bio = 0x2300, net = 0x2300, tty = 0x2400, imp = 0x2400
interrupt levels: bio = 3, net = 3, tty = 4
root device: le0
file system (default generic):
mountroot: trying nfs...
nfs_boot: trying DHCP/BOOTP
nfs_boot: DHCP server: 18.104.22.168
root on 22.214.171.124:/newusrd/os/BSD/root/ikpv09-zel
root time: 0x38287455
root file system type: nfs
init: copying out flags `-s' 3
init: copying out path `/sbin/init' 11
Enter pathname of shell or RETURN for sh:
# setting tty flags
default zam047-n done
configuring network interfaces:.
add net default: gateway 126.96.36.199
swapctl: adding zelvs1:/ca1/os/NetBSD/swap/ikpv09-zel as swap device at
starting system logger
checking for core dump...
savecore: no core dump (no dumpdev)