count = 4000
while count > 0
    sendln "mw.b 8a000000 0xFF 0x100000;"
    wait '=>'
    sendln "setenv quiet 1;sf probe;sf update 8a000000 40000 100000;"
    wait '=>'
    sendln "mw.b 8a000000 0x00 0x100000;"
    wait '=>'
    sendln "setenv quiet 1;sf probe;sf update 8a000000 40000 100000;"
    count = count -1
endwhile