On Fri, 12 May 2000, Gregor Pogatzki wrote:
> I am testing Linux on an SA-1110 Assabet board and I have got some
>problems/questions.
>
> 1. I cannot use the system with just one serial port, like it is described in the
>Assabet Documentation included in the kernel patch (diff-2.3.99-pre6-rmk1-np1). After
>downloading with angelboot and starting minicom I get a login prompt in the minicom
>window and on the LCD-display. But I am not able to type anything in the minicom
>window, so I cannot login or do anything else. When using the SA-1111 companion
>board, I can connect a second minicom via a second serial port (J16 on the companion
>board) and do my input in that minicom-window. The first minicom then shows my input
>and the output of the linux system. (The LCD display shows no further messages and
>switches off after a while.)
> So what can I do to run the whole thing without the companion board (without the
>second serial connection)?
Be sure you turned all flow controls to "off" in minicom.
> 2. The system seems to be extremly slow. I compiled an mp3 encoding algorithm with
>my cross compiler (cross-armv4l-linux-gcc-0.4_2.95.2-6.i386). It takes about 13
>minutes to encode just 4 seconds of music!! On a 450 Mhz Pentium III it takes one or
>two seconds. So the StrongARM seems to be about 600 times slower! What can I do do
>make it faster?
You should use fixed point math techniques. Some fixed point MP3 players
already exist and perform pretty well. There is no MP3 encoder with fixed
point computation yet that I'm aware of though.
> Is there any Initialization to be done, to make the StrongARM running on full 221Mhz
>clock frequency?
It is already done.
> What compiler options should I use to make a program as fast as possible on SA-1110?
-cpu-strongarm110 -O2
> 3. Is there a driver for the UDA 1341 audio codec?
I'm writing one at the moment. My latest patch contains one that can do
playback with 44100Hz stereo bolted in but it crashes when your playback
ends. This is work in progress.
Nicolas
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