Thanks, that was very helpful! As a further test I switched Minicom to 'ANSI' terminal emulation instead of 'VT102', but there was no improvement. Interestingly, U-boot's own menu displays highlighting as it should, but the sd-boot menu does not. I'll try to follow up with the U-boot project to see what might be going on with their UEFI implementation.
On Sat, Dec 28, 2024, at 19:24, Mantas Mikulėnas wrote:
On Sat, Dec 28, 2024, 20:38 Kevin P. Fleming <lists.systemd-devel@xxxxxxxxxxxxx> wrote:I've got three machines which have serial (only) consoles, all of which are using sd-boot from systemd 257. I use Minicom, in VT102 mode, to connect to these machines, and while the console generally works, there is no 'highlighting' in the sd-boot menu. As a result it's rather difficult to choose a non-default entry to boot.What terminal type is sd-boot expecting?None. It outputs text using the EFI ConOut interface, which is not a terminal-style interface at all – it's more like the DOS or Windows console, with discrete APIs for cursor positioning and text formatting [1].It's your system firmware which decides how to translate those API calls to VT220 sequences or something similar.[1]: https://uefi.org/specs/UEFI/2.9_A/12_Protocols_Console_Support.html#efi-simple-text-output-protocol
