switch command in /boot

[Tetsuya Isaki <isaki%pastel-flower.jp@localhost>]

Hi all,

I wrote a simple manual for the 'switch' command on /boot
that was just committed.

--------

syntax

  'switch' (without any arguments) displays usage.
  'switch show' display all supported parameters.
  'switch <key>=<value>' style commands modify parameters.

  Currently the command supports just only three parameters:
    boot, rom and memory

parameter
  boot
        'boot' parameter indicates the boot device or the boot
        order. its valid values are:

          boot=std
                set boot order to 'STD'.
                STD means FD (-> SASI) -> ROM -> RAM.
          boot=fd<N>
                set primary boot device to FD0-FD3.
          boot=rom
                set primary boot device to ROM.
                You must also set the ROM address properly.

        In addition, it supports two convenient alias:

          boot=inscsi<N>
                set primary boot device to internal SCSI ID0-7.
                It's a combination of these two commands:
                  boot=rom
                  rom=inscsi<N>
          boot=exscsi<N>
                set primary boot device to external SCSI ID0-7.

  rom
        'rom' parameter indicates the ROM boot address. its syntax is:

          rom=$xxxxxx
                set the ROM boot address to $xxxxxx.
                ('$' mark is required)

        and it also supports two convenient alias:

          rom=inscsi<N>
                set the ROM boot address to $fc0000 + N * 4
          rom=exscsi<N>
                set the ROM boot address to $ea0020 + N * 4

  memory
        'memory' parameter indicates the memory size recorded in SRAM.

          memory=12     .. set the memory size to 12MB.

        maybe someone wants to implement memory=auto immediately :)

(EOF)
--------
---
Tetsuya Isaki <isaki%pastel-flower.jp@localhost / isaki%NetBSD.org@localhost>