On Wed, 27 Nov 2024 14:17:29 GMT Justin Hibbits <jhibb...@freebsd.org> wrote:
> The branch main has been updated by jhibbits: > > URL: > https://cgit.FreeBSD.org/src/commit/?id=09ef538713e08a98584dbcf66ff80290cc1b41a2 > > commit 09ef538713e08a98584dbcf66ff80290cc1b41a2 > Author: Justin Hibbits <jhibb...@freebsd.org> > AuthorDate: 2024-11-20 17:08:26 +0000 > Commit: Justin Hibbits <jhibb...@freebsd.org> > CommitDate: 2024-11-27 14:17:09 +0000 > > uart: Add primitive noise filtering on RX > > A long cable attached to the UART can act as an antenna if > disconnected from the other end. This can cause noise on the receive > side, possibly as reflections from the transmit side, leading to an > interrupt storm. Filter this by adding a threshold of received > characters without TX ready, above which characters are dropped. > This is disabled by default, but has been tested with a threshold of > 1000+. A high threshold is recommended to avoid dropping characters > during, for instance, a large copy/paste from the other end. > > Sponsored by: Juniper Networks, Inc. Reviewed by: imp Differential Revision: https://reviews.freebsd.org/D47685 - Justin
