Hi, On Fri, 4 Nov 2022 at 02:07, Jan Kiszka <jan.kis...@siemens.com> wrote: > > From: Jan Kiszka <jan.kis...@siemens.com> > > Before clearing the screen, ensure that no previous output of firmware > or UEFI programs will be overwritten on serial devices or other > streaming consoles. This helps generating complete boot logs. > > Tested regarding multi-output against qemu-x86_defconfig. > > Signed-off-by: Jan Kiszka <jan.kis...@siemens.com> > --- > lib/efi_loader/efi_console.c | 8 +++++++- > 1 file changed, 7 insertions(+), 1 deletion(-)
Please see this thread...some things need to be improved in this area. https://patchwork.ozlabs.org/project/uboot/patch/20221022092058.106052-1-heinrich.schucha...@canonical.com/ > > diff --git a/lib/efi_loader/efi_console.c b/lib/efi_loader/efi_console.c > index 4d08dd3763a..6ce0fcc168d 100644 > --- a/lib/efi_loader/efi_console.c > +++ b/lib/efi_loader/efi_console.c > @@ -461,10 +461,16 @@ static efi_status_t EFIAPI efi_cout_set_attribute( > } > > /** > - * efi_cout_clear_screen() - clear screen > + * efi_clear_screen() - clear screen > */ > static void efi_clear_screen(void) > { > + unsigned int row; > + > + /* Avoid overwriting previous outputs on streaming consoles */ > + for (row = 1; row < efi_cout_modes[efi_con_mode.mode].rows; row++) > + printf("\n"); > + > /* > * The Linux console wants both a clear and a home command. The video > * uclass does not support <ESC>[H without coordinates, yet. > -- > 2.35.3 > Regards, SImon
