nanogui@linuxhacker.org

Hi Jay,
    Interesting. What transfer program you are using? I can't get the lrz to
work on my Helio unfortunately. Also I notice that the size of the lrz and
lsz was relatively large, approx. 264K bytes, compare to the rz is about
91K. I have applied the changes it seems it has some improvement on the
throughput but I still can't transfer more than 5120 bytes from minicom host
to Helio rz.
    Thanks
    CC

----- Original Message -----
From: Jay Carlson <nop@nop.com>
To: CCYau <imaxsz@szonline.net>; <nanogui@linuxhacker.org>
Cc: <linuxce-devel@linuxce.org>
Sent: Tuesday, October 24, 2000 8:57 AM
Subject: RE: [linuxce-devel] rzsz working partially on VTech Helio


> CCYau writes:
>
> > Dear folks:
> >    The rz sz utility from www.omen.com  was partially working with VTech
> Helio with very few modifications.
> >    5) the binary file rz and sz can download to Helio. I'm using minicom
> to act as serial console to the Helio. On minicom, I can sz any file from
> VTech helio with rz in minicom. If I change /mnt on VTech Helio, I can
> upload a file from Host minicom to Helio.
> >    There is still not reliable and always TIMEOUT, and the transfer
speed
> was very low.
> >    I hopes I can fix these out  so we can have one useful utility on the
> VTech Helio development. If anyone has any idea, I will be highly
> appreciated.
>
> What version of the kernel are you using?  Last night, I committed two
> changes to drivers/char/r39xx_serial.c that should dramatically improve
> serial performance.
>
> The first fix should make serial IO work again.  I don't understand how it
> could possibly work without it---TX interrupts were being disabled
forever.
> This may not apply to earlier kernels.
>
> The second reduces the wait between reading the UART from 10 microseconds
to
> 1 microsecond.  If this causes problems on hardware besides the Helio, let
> me know.  I'd like to reduce the wait for transmit to 1 microsecond as
well.
>
> With these changes, the Helio can successfully receive 2M of data
> transmitted using 1K XModem at 115kbps.  Throughput is around
9.1kbytes/sec.
> I imagine ZModem will do even better, although the lrzsz package may have
> more success than omen.com.
>
> The funny thing is, I can't receive more than ~2.1-2.5M of data without
the
> transfer stalling out.  I think this *could* be my code having problems,
but
> there is no obvious reason for it.  Has anyone else seen symptoms like
this?
>
> Jay
>
>
>
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