[OLPC Engineering] [Techteam] XO-1.75 OpenFirmware serial terminal
wmb at laptop.org
Thu Mar 29 01:56:56 EDT 2012
The space required by the serial terminal thing is insignificant.
On 3/28/2012 4:44 PM, John Watlington wrote:
> On Mar 27, 2012, at 5:52 AM, James Cameron wrote:
>> This is a serial terminal implementation for an XO-1.75 using Open Firmware.
> Useful --- the computer science equivalent of the voltmeter.
> Educational --- I learned that OFW has structs, and some new primitives (/n, ukey).
>> Credit to the existing Open Firmware serial port FIFO queue
>> implementation. Couldn't have made it stable without it.
> Nice. It is cool to see a Forth version of what I wrote so many
> variations of in C.
> My favorite two lines (for simplicity) in the terminal emulator were:
> \ serial interrupt handler for received data
> : si ( -- ) ukey read-q enque ;
> I'd love to see serial terminal preloaded, but also acknowledge that I'm the
> one pushing against a 2MB SPI Flash ROM. How about specifying
> a location in the main build, where another 20KB of example OFW code
> isn't as important ? Say:
> devalias lib int:2 # build a pointer to the library into OFW
> dir lib:\ofwlib\ # See what is available (anyway to avoid the dir name ?)
> fload lib:\ofwlib\serial.fth
> We could also move some of the existing non-essential OFW utilities there as
> SPI Flash ROM space gets tighter, such as emacs.
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