Re: [U-Boot] Question about baud rate
Hi Dan, I'm using a board similar to canyonlands with a ppc460ex. The baud rate for ttyS0 is set to 115200 by the console= bootarg, but I'd also like to set ttyS1-3 to 115200 also. Why doe you want to setup this parameters from the outside? Really only the serial device used for a console needs to be setup by firmware. All other serial devices should be initialized by the user space programs using them. For each of the three uarts, the device tree has the following line: current-speed = 0; /* Filled in by U-Boot */ Checking current U-Boot code, I believe this comment is simply wrong. I cannot see any part in the canyonlands / or generic 4xx infrastructure that fixes up these properties. Maybe Stefan can comment on this though. How do I go about configuring u-boot to fill these with the baud rate I choose? Sorry for the silly question! I don;t think its a silly question, but I also think that you do not need the configuration ;) Cheers Detlev -- One of the main causes of the fall of the Roman Empire was that, lacking zero, they had no way to indicate successful termination of their C programs. -- Robert Firth -- DENX Software Engineering GmbH, MD: Wolfgang Denk Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: d...@denx.de ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] Question about baud rate
Why doe you want to setup this parameters from the outside? Really only the serial device used for a console needs to be setup by firmware. All other serial devices should be initialized by the user space programs using them. I would like my startup script to cat messages to ttyS1, as well as to the console (ttyS0). Basically for the purpose of informing users that the firmware cannot execute for some reason (we don't like to give access to the console). I was trying to avoid including stty or setserial, but if this is the accepted way to configure the serial port it's not a big deal ;-) For each of the three uarts, the device tree has the following line: current-speed = 0; /* Filled in by U-Boot */ Checking current U-Boot code, I believe this comment is simply wrong. I cannot see any part in the canyonlands / or generic 4xx infrastructure that fixes up these properties. Maybe Stefan can comment on this though. Interesting...I also tried manually entering a value here, but it didn't seem to have any effect. Maybe it just isn't used? Sorry for the silly question! I don;t think its a silly question, but I also think that you do not need the configuration ;) Cheers Detlev Thanks for your response! Regards, Dan ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] Question about baud rate
Hi Dan, Why doe you want to setup this parameters from the outside? Really only the serial device used for a console needs to be setup by firmware. All other serial devices should be initialized by the user space programs using them. I would like my startup script to cat messages to ttyS1, as well as to the console (ttyS0). Basically for the purpose of informing users that the firmware cannot execute for some reason (we don't like to give access to the console). I was trying to avoid including stty or setserial, but if this is the accepted way to configure the serial port it's not a big deal ;-) Personally I believe that every software task should setup as much as possible from what it knows to be needed for its own work. For a serial program this includes setting the baud rate and the communications parameter like 8/n/1. For each of the three uarts, the device tree has the following line: current-speed = 0; /* Filled in by U-Boot */ Checking current U-Boot code, I believe this comment is simply wrong. I cannot see any part in the canyonlands / or generic 4xx infrastructure that fixes up these properties. Maybe Stefan can comment on this though. Interesting...I also tried manually entering a value here, but it didn't seem to have any effect. Maybe it just isn't used? This may very well be the case. An answer can probably be found on the linux ppc mailing list[1] ;) Sorry for the silly question! I don;t think its a silly question, but I also think that you do not need the configuration ;) Cheers Detlev Thanks for your response! You're welcome! Detlev [1] http://dir.gmane.org/gmane.linux.ports.ppc64.devel PowerPC developers ML linuxppc-...@ozlabs.org -- Every time history repeats itself the price goes up. -- DENX Software Engineering GmbH, MD: Wolfgang Denk Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: d...@denx.de ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
