[ECOS] ymodem problems

[ECOS] ymodem problems

[Øyvind Harboe]

I was having trouble with ymodem uploads today.

I was unable to upload via HyperTerminal from  a sluggish fileserver
(this server was having problems today with random 5-10 second pauses).
The upload work run fine for 10-100%, and then suddenly stop. If I
copied the file locally to my machine, I could upload via HyperTerminal
just fine.

Before I embark on devicing a testbench, etc. does anyone have a word of
advice on whether I'm looking in the right place?

Rounding up the usual suspects:

- at91 serial drivers. The same problem appears with and without the PDC
code enabled.
- HyperTerminal. A fine piece of software from the early 90's. 
- redboot ymodem routines. Do the ymodem redboot routines have
difficulties recovering from a period of silence/errors?

Øyvind



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Re: [ECOS] ymodem problems

[Artur Lipowski]

Øyvind Harboe wrote:

...
> - at91 serial drivers. The same problem appears with and without the PDC
> code enabled.
SOA #1

> - HyperTerminal. A fine piece of software from the early 90's. 
IMHO it is not good software (to be honest).
I remember (from another forum) many problems and complaints from people 
using Hypertermnial for communication with AVRs.

> - redboot ymodem routines. Do the ymodem redboot routines have
> difficulties recovering from a period of silence/errors?
There are some timeouts coded inside so it depends how long/many 
silence/errors you encounter. Eg. I started loading ELF image then 
decided to stop transfer and it takes over 30 seconds before redboot 
give up and display "prompt".
I also found (not much investigation) that redboot running from ROM (on 
EB40A) is not capable to transfer at higher speed than 56kbs.

Regards,
-- 
Artur Lipowski

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