Hello, On Tue, Apr 04, 2023 at 01:42:36PM +0200, Javier Martinez Canillas wrote: > Martijn Braam <martijn@xxxxxxxxx> writes: > > > On 4/4/23 09:51, Heiko Stübner wrote: > >> Hi, > >> > >> Am Montag, 3. April 2023, 19:59:37 CEST schrieb Javier Martinez Canillas: > >>> This baud rate is set for the device by mainline u-boot and is also what > >>> is set in the Pinebook Pro Device Tree, which is a device similar to the > >>> PinePhone Pro but with a different form factor. > >>> > >>> Otherwise, the baud rate of the firmware and Linux don't match by default > >>> and a 'console=ttyS2,1500000n8' kernel command line parameter is required > >>> to have proper output for both. > >> The interesting question is always if this will break someone else's setup. > >> I've never really understood the strange setting of 1.5MBps, but on the > >> other hand it _is_ a reality on most boards. > > > > It breaks my device test setup at least. The extra speed isn't worth the > > hassle > > More than the extra speed is to have consistency accross all the rockchip > devices in upstream and also sync with mainline u-boot. > > > of having a few devices at weird baudrates and the bootloader already > > starts outputting debug logs at 115200 baud. > > > > And mine starts outputting at 1.5MBps :) I guess that there isn't a one > size fits all, so the question is whether the bikeshed color is what was > painted in all other rockchip boards or the one that Tow-Boot has chosen. For what it's worth, levinboot also defaults to 1.5 Mbaud. https://gitlab.com/DeltaGem/levinboot/-/blob/release/rk3399/entry.S#L65 https://gitlab.com/DeltaGem/levinboot/-/blob/release/configure.py#L67 And it's very nice anything above >115200 is not broken by bad HW design, like on original Pinephone, so this higher speed actually works. ;) kind regards, o. > -- > Best regards, > > Javier Martinez Canillas > Core Platforms > Red Hat >
