diary at Telent Netowrks

Baud games#

Sun, 07 Jan 2018 11:46:21 +0000

Epiphany (n): (1) January 6 observed as a church festival in commemoration of the coming of the Magi as the first manifestation of Christ to the Gentiles or in the Eastern Church in commemoration of the baptism of Christ; (2) a moment of sudden and great revelation or realization.


This week in NixWRT was typified by lots of trying stuff that didn't work followed by an unexpected achievement: I have a shell running on the actual hardware!

When we left off last week , if you will recall, we had a kernel that booted most of the way to mounting the root filesystem and executing init but not quite, and for some odd reason it booted a little bit further if I lied to it about the console device. Since then:

This is simultaneously a victory and a complete PITA, because there's no way to change the baud rate in this feature-impoverished branch of u-boot , so every time I reboot I have to change speed back and forth to talk to the bootloader. It would be nice if we could get it to work at 250000 (perhaps the u-boot console code has some pointers), or find a way to make u-boot speak more slowly, and I will probably look at that at some point.

Other things to do

[ Postemporaneous edit: the next thrilling installment in this series is now up at https://ww.telent.net/2018/1/15/in_the_nix_of_time ]