Le jeu. 27 mai 2021 à 18:24, Grant Likely <grant.lik...@arm.com> a écrit :
> On 24/05/2021 18:42, François Ozog wrote:
> > Hi,
> >
> > I verified that RPI4 can boot Ubuntu and LEDGE RP with UEFI + U-Boot.
> > Two flows have been checked: direct (kernel+initrd in BootXXX variable
> > leveraging LOAD_FILE2 mechanism) and through grub.
> >
> > Note: Grub (current head) behaves properly but does not display anything
> on
> > serial console because lack of U-Boot (2021.07-rc2) support for:
> >
> > GRUB_EFI_SERIAL_IO_GUID \
> >
> > { 0xbb25cf6f, 0xf1d4, 0x11d2, \
> >
> > { 0x9a, 0x0c, 0x00, 0x90, 0x27, 0x3f, 0xc1, 0xfd } \
> >
> > }
> >
> >
> > /* details: grub-core/term/efi/serial.c, grub_efiserial_init() ->
> > grub_efi_locate_handle
> > (GRUB_EFI_BY_PROTOCOL, &serial_io_guid,...) returns NULL */
>
> This doesn't look right to me. U-Boot provides the SimpleTextProtocol
> which Grub can use to display the menu over either UART or framebuffer.
> The SERIAL_IO protocol is not required. If you aren't getting output on
> the serial console then it is more likely a U-Boot configuration problem
> rather than missing functionality.
the rescue mode works nicely. The menu display does not. Is it because I am
using Grub head ?
>
>
> g.
>
> >
> >
> > So I think we need to add this protocol and some others to make the UEFI
> > text environment fully supported for grub.
> >
> >
> > Cheers
> >
> >
> > FF
> >
> >
> > PS: It would be nice to have an efidebug command to actually trace all
> boot
> > services calls to "get_protocol" and either trace all requests or just
> > failed requests.
> >
>
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--
François-Frédéric Ozog | *Director Linaro Edge & Fog Computing Group*
T: +33.67221.6485
francois.o...@linaro.org | Skype: ffozog
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