cdcboot.rb

#!/usr/bin/env ruby

require 'rubygems'

gem 'ruby-serialport','>=0.7.0'

require 'serialport'

$sp = SerialPort.new('/dev/tty.usbmodem2411', 115200, 8, 1, 0)
$sp.binmode

matchword_msg = [ '00aaa5' ]
p matchword_msg.pack('H*');
$sp.write matchword_msg.pack('H*');
$sp.flush
retbin = $sp.read(1)
ret = retbin.unpack("H*")
p ret[0]
if ret[0] != '55' then
 raise 'Negociation failed.'
end
p 'Connection established.'

def _send_hidcmd_hdr
       hidcmd_hdr = [ '00' * 60 + 'aa55' ] ## dummy aa 55
       $sp.write hidcmd_hdr.pack('H*')
end

def load(base_addr, fname)

    chunk_len = 16

    b = open(fname)
    b.binmode

    addr = base_addr

    while true do
        chunk = b.read(chunk_len)
        break if !chunk
        len = chunk.bytesize

        _send_hidcmd_hdr

        transfer_hdr = '010400' # MONIT_SOF HIDASP_POKE, MEM_BYTE
        packet = [ transfer_hdr, len, addr ].pack('H6vV') + chunk

        packet += "\0" * (60 - packet.bytesize)
        $sp.write packet
        $sp.flush
        break if len < chunk_len
        addr += len
    end
end

def jump(addr)

    _send_hidcmd_hdr

    exec_hdr = "010600" # MONIT_SOF HIDASP_JMP DUMMY
    packet = [ exec_hdr, 1, addr ].pack('H6vV')
    packet += "\0" * (60 - packet.bytesize)
    p packet.length
    $sp.write packet
    $sp.flush
end

def reset_vector(fname)
    b = open(fname)
    b.binmode
    b.read(4).unpack('N')
end

base_addr = 0x1c000000

load base_addr, 'SH2A-1C000000.bin'
jump reset_vector('SH2A-1C000000.bin')[0]
#p reset_vector('SH2A-1C000000.bin')

CDCLINK対応のホスト側ブートローダが Win32ベッタリなので「Ruby で書き換えてみてやんよ」って始めたら結構ハマった．でもとりあえずOSXからSH2Aのファームを流しこむのはできた．
他CPU対応とかコマンドライン引数処理とかクラス化とか，そういうの力尽きたので，とりあえず貼って終わりにする．