Re: Timeout broken with serial port

2011-09-06 Thread richardvo...@gmail.com
On Mon, Sep 5, 2011 at 3:51 PM, Aleš Nesrsta wrote: > Hi, > > I think it is not GRUB related problem, more probably there is some HW > problem on Your serial port. Try to check idle voltage on RxD pin of > serial port (best with oscilloscope... :-) ). Or You can have some > unwanted "leakage" betw

Re: Timeout broken with serial port

2011-09-06 Thread Vladimir 'φ-coder/phcoder' Serbinenko
> But, generally, there could be many partially or fully broken HW > parts on PC and it is impossible to warn everybody against all of > them... :-) > Why not? "Your computer is manufactured by Sony/Apple/..., it may have hardware defects and exhibit any kind of known or unknown, predictable or unp

Re: Timeout broken with serial port

2011-09-06 Thread Vladimir 'φ-coder/phcoder' Serbinenko
On 06.09.2011 02:05, Lennart Sorensen wrote: > If the UART (not grub) interprets noise as valid data, then it will pass > that to grub which legitimately sees that as keypresses. I agree with both sides of dispute. It's a hardware bug but GRUB has reliability and unattended boot as one of its goals

Re: Timeout broken with serial port

2011-09-06 Thread starous
wrote: > On 5 September 2011 22:51, Aleš Nesrsta > wrote: > > Hi, > > > > I think it is not GRUB related problem, more > > probably there is some HW > > > problem on Your serial port. Try to check idle > > voltage on RxD pin of > > > serial port (best with oscilloscope... :-) ). Or > > You can ha

Re: Timeout broken with serial port

2011-09-05 Thread Michal Suchanek
On 5 September 2011 22:51, Aleš Nesrsta wrote: > Hi, > > I think it is not GRUB related problem, more probably there is some HW > problem on Your serial port. Try to check idle voltage on RxD pin of > serial port (best with oscilloscope... :-) ). Or You can have some > unwanted "leakage" between p

Re: Timeout broken with serial port

2011-09-05 Thread Lennart Sorensen
On Mon, Sep 05, 2011 at 09:40:42PM +0200, Michal Suchanek wrote: > I did not have the cable connected at all at the other end. Connecting > it to my notebook resolves the problem. > > Still it is definitely a bug in Grub that it interprets noise as keypresses. > > Is there not DTR line? > > If e

Re: Timeout broken with serial port

2011-09-05 Thread Aleš Nesrsta
Hi, I think it is not GRUB related problem, more probably there is some HW problem on Your serial port. Try to check idle voltage on RxD pin of serial port (best with oscilloscope... :-) ). Or You can have some unwanted "leakage" between pins of connector or wires in cable (check resistance betwee

Re: Timeout broken with serial port

2011-09-05 Thread Michal Suchanek
2011/8/24 Vladimir 'φ-coder/phcoder' Serbinenko : > On 24.08.2011 11:16, Michal Suchanek wrote: >> Hello, >> >> I was experiencing a mysterious error with grub. It would not boot >> with timeout set. >> >> It turns out that setting serial IO disables timeout. > Check your contacts. Bad contacts are

Re: Timeout broken with serial port

2011-08-24 Thread Vladimir 'φ-coder/phcoder' Serbinenko
On 24.08.2011 11:16, Michal Suchanek wrote: > Hello, > > I was experiencing a mysterious error with grub. It would not boot > with timeout set. > > It turns out that setting serial IO disables timeout. Check your contacts. Bad contacts are known to send noise on I/O which GRUB interprets as keypres

Timeout broken with serial port

2011-08-24 Thread Michal Suchanek
Hello, I was experiencing a mysterious error with grub. It would not boot with timeout set. It turns out that setting serial IO disables timeout. grub-pc1.99-11ubuntu1 I think it used to work with earlier grub, I have this file for ages: # cat /etc/grub.d/03_serial #!/bin/sh echo seri