* [ECOS] redboot with console baudrate 115200
@ 2006-05-05 11:58 Dirk Eibach
2006-05-05 12:25 ` Andrew Lunn
0 siblings, 1 reply; 5+ messages in thread
From: Dirk Eibach @ 2006-05-05 11:58 UTC (permalink / raw)
To: ecos-discuss
Hello,
I'm trying to get redboot running with a console baudrate of 115200 on
an Atmel EB40A board.
First everything looks fine:
I can read the output from redboot after power-up, enter commands and
these things.
The problem is that file downloads via xmodem don't work with the higher
baudrate.
Any suggestions ?
Best regards
Matthias
--
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [ECOS] redboot with console baudrate 115200
2006-05-05 11:58 [ECOS] redboot with console baudrate 115200 Dirk Eibach
@ 2006-05-05 12:25 ` Andrew Lunn
2006-06-07 8:55 ` Jürgen Lambrecht
0 siblings, 1 reply; 5+ messages in thread
From: Andrew Lunn @ 2006-05-05 12:25 UTC (permalink / raw)
To: Dirk Eibach; +Cc: ecos-discuss
On Fri, May 05, 2006 at 01:55:02PM +0200, Dirk Eibach wrote:
> Hello,
>
> I'm trying to get redboot running with a console baudrate of 115200 on
> an Atmel EB40A board.
>
> First everything looks fine:
> I can read the output from redboot after power-up, enter commands and
> these things.
>
> The problem is that file downloads via xmodem don't work with the higher
> baudrate.
>
> Any suggestions ?
Probably you are overflowing the receive buffer and so causing CRC
errors. Try a slower speed.
Andrew
--
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [ECOS] redboot with console baudrate 115200
2006-05-05 12:25 ` Andrew Lunn
@ 2006-06-07 8:55 ` Jürgen Lambrecht
2006-06-07 9:00 ` Andrew Lunn
2006-06-07 13:43 ` GONZALEZ Laurent
0 siblings, 2 replies; 5+ messages in thread
From: Jürgen Lambrecht @ 2006-06-07 8:55 UTC (permalink / raw)
To: Dirk Eibach; +Cc: Andrew Lunn, ecos-discuss, vez
Hello,
on my custom board based on eb55 (also AT91M55800), I have the same
problem: Redboot works fine with all baudrates, but ymodem or xmodem not.
The highest speed I can use is 19200 baud.
Also Vince Z. has the same problem. Like him, I now also use TFTP instead.
The strange thing is that on the eb55 demoboard, 38400 downloads are no
problem.
Kind regards,
Juergen
Andrew Lunn wrote:
> On Fri, May 05, 2006 at 01:55:02PM +0200, Dirk Eibach wrote:
>
>>Hello,
>>
>>I'm trying to get redboot running with a console baudrate of 115200 on
>>an Atmel EB40A board.
>>
>>First everything looks fine:
>>I can read the output from redboot after power-up, enter commands and
>>these things.
>>
>>The problem is that file downloads via xmodem don't work with the higher
>>baudrate.
>>
>>Any suggestions ?
>
>
> Probably you are overflowing the receive buffer and so causing CRC
> errors. Try a slower speed.
>
> Andrew
>
--
Jürgen Lambrecht
Diksmuidse Heerweg 338
8200 Sint-Andries
Tel: +32 (0)50 842901
GSM: +32 (0)476 313389
--
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [ECOS] redboot with console baudrate 115200
2006-06-07 8:55 ` Jürgen Lambrecht
@ 2006-06-07 9:00 ` Andrew Lunn
2006-06-07 13:43 ` GONZALEZ Laurent
1 sibling, 0 replies; 5+ messages in thread
From: Andrew Lunn @ 2006-06-07 9:00 UTC (permalink / raw)
To: J?rgen Lambrecht; +Cc: ecos-discuss
On Wed, Jun 07, 2006 at 10:55:09AM +0200, J?rgen Lambrecht wrote:
> Hello,
>
> on my custom board based on eb55 (also AT91M55800), I have the same
> problem: Redboot works fine with all baudrates, but ymodem or xmodem not.
> The highest speed I can use is 19200 baud.
> Also Vince Z. has the same problem. Like him, I now also use TFTP instead.
>
> The strange thing is that on the eb55 demoboard, 38400 downloads are no
> problem.
How accurate is your boad rate generator? I think the older AT91 cores
had a limited baud rate generator which could not always generate the
exact baud rate needed. It could be the error is too big for higher
boad rates.
Andrew
--
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [ECOS] redboot with console baudrate 115200
2006-06-07 8:55 ` Jürgen Lambrecht
2006-06-07 9:00 ` Andrew Lunn
@ 2006-06-07 13:43 ` GONZALEZ Laurent
1 sibling, 0 replies; 5+ messages in thread
From: GONZALEZ Laurent @ 2006-06-07 13:43 UTC (permalink / raw)
To: ecos-discuss
On Wed, 07 Jun 2006 10:55:09 +0200
Jürgen Lambrecht <Jurgen.Lambrecht@tiscali.be> wrote:
>
> The strange thing is that on the eb55 demoboard, 38400 downloads are no
> problem.
Do both boards use the same quartz ? Is internal PLL programmed in a similar way ? Are the timing/width of SRAM or flash access identical ?
It may look strange, but at 38400, the one-char buffer time-frame does not meet the critical path of xmodem routine, and sometime char is lost. Remind that this path increases a lot if you try to download an elf (compared to raw).
A few years ago there has been discussion here about a buffered serial driver (in kernel configurations, using interrupts), but I am not sure that the hal-serial used by redboot has been enhanced in the same way.
best regards.
--
GONZALEZ Laurent
-----------------------------------------
TRANGO Systems - ELSYS Design Group
74, avenue des Martyrs
38000 Grenoble
Tel: 33 (0)4 76 12 28 44
Fax: 33 (0)4 76 12 28 49
-----------------------------------------
Trango, the real-time embedded hypervisor
http://www.trango-systems.com
--
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2006-06-07 13:43 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2006-05-05 11:58 [ECOS] redboot with console baudrate 115200 Dirk Eibach
2006-05-05 12:25 ` Andrew Lunn
2006-06-07 8:55 ` Jürgen Lambrecht
2006-06-07 9:00 ` Andrew Lunn
2006-06-07 13:43 ` GONZALEZ Laurent
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).