nanogui: Re: [linuxce-devel] rzsz working partially on VTech Helio
Subject:
RE: [linuxce-devel] rzsz working partially on VTech Helio
From:
"Jay Carlson" ####@####.####
Date:
24 Oct 2000 00:53:01 -0000
Message-Id: <KEEOIBGCMINLAHMMNDJNAECLCAAA.nop@nop.com>
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
