NetBSD/ews4800mips 9.0 on NEC EWS4800/360AD

[Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>]

Since my NEC Express5800/230 and NetBSD/arc have been
almost fixed, next I've tried to revive my NEC EWS4800/360AD.

Its MK48T18B NVRAM battery was dead back in 2003, and
the firmware started to require a password on entering
setup mode (probably due to mangled NVRAM data, i.e.
there was no sanity check against data corruptions),
so I could not boot any operating system on it.

I de-soldered the dead MK48T18B chip, added an IC socket,
and put a newly ordered M48T18 onto it, then all settings
are cleared properly and finally I can try to boot
NetBSD/ews4800mips loaders again. (though I also have to
prepare a customized bootloader binary to write MAC address
values into the fresh NVRAM chip)

The NetBSD/ews4800mips 9.0 GENERIC kernel just works,
including framebuffer (that uses wired map).

Note there is something wrong in bootloader (/usr/mdec/boot)
binary so it gets "Illegal exception" error just after it's loaded
by the primary bootxx_bfs.  An old /usr/mdec/boot binary from
NetBSD/ews4800mips 5.0 still works.

I'll check what's wrong, but I would like to just announce
"yet another rare mips port and machines are still alive." :-)

---
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    2018, 2019, 2020 The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 9.0 (GENERIC) #0: Fri Feb 14 00:06:28 UTC 2020
	mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/ews4800mips/compile/GENERIC
NEC EWS4800/360AD (TR2A) 150MHz
total memory = 98304 KB
avail memory = 92440 KB
timecounter: Timecounters tick every 10.000 msec
Kernelized RAIDframe activated
mainbus0 (root)
cpu0 at mainbus0: MIPS R4400 CPU (0x450) Rev. 5.0 with MIPS R4010 FPC Rev. 0.0
cpu0: 48 TLB entries, 16MB max page size
cpu0: 16KB/32B direct-mapped L1 instruction cache
cpu0: 16KB/16B direct-mapped write-back L1 data cache
cpu0: 1024KB/128B direct-mapped write-back L2 unified cache
sbdio0 at mainbus0
le0 at sbdio0 at 0x1e400000 irq 0: address 00:00:4c:31:6d:0e
le0: 32 receive buffers, 8 transmit buffers
zsc0 at sbdio0 at 0x1e440000 irq 4
zstty0 at zsc0 channel 0
zstty1 at zsc0 channel 1
zsc1 at sbdio0 at 0x1e480000 irq 9
ewsms0 at zsc1 channel 0: baud rate 1200
wsmouse0 at ewsms0 mux 0
ewskbd0 at zsc1 channel 1: baud rate 4800
wskbd0 at ewskbd0: console keyboard
mkclock0 at sbdio0 at 0x1e490000: mk48t18
osiop0 at sbdio0 at 0x1e500000 irq 6: NCR53C710 rev 2, 25MHz, SCSI ID 7
scsibus0 at osiop0: 8 targets, 8 luns per target
osiop1 at sbdio0 at 0x1e510000 irq 10: NCR53C710 rev 2, 25MHz, SCSI ID 7
scsibus1 at osiop1: 8 targets, 8 luns per target
fb0 at sbdio0 at 0xf0000000, 0xf5f00000
wsdisplay0 at fb0 kbdmux 1: console (std, vt100 emulation), using wskbd0
wsmux1: connecting to wsdisplay0
timecounter: Timecounter "clockinterrupt" frequency 100 Hz quality 0
timecounter: Timecounter "mips3_cp0_counter" frequency 75000000 Hz quality 100
scsibus0: waiting 2 seconds for devices to settle...
scsibus1: waiting 2 seconds for devices to settle...
sd0 at scsibus0 target 0 lun 0: <MELCO, DSC-G, 1.00> disk fixed
sd0: 30533 MB, 62037 cyl, 16 head, 63 sec, 512 bytes/sect x 62533296 sectors
sd0: sync (200.00ns offset 8), 8-bit (5.000MB/s) transfers
root on sd0a dumps on sd0b
root file system type: ffs
kern.module.path=/stand/ews4800mips/9.0/modules
---

Have fun,
---
Izumi Tsutsui