My board is Intel Oxbohill CRB (Apollo lake). On my board UART are not connected to PCI.
I am using grub2 payload loaded by coreboot. UART works fine in coreboot by using memory mapped 8050 driver ( https://github.com/coreboot/coreboot/blob/master/src/drivers/uart/uart8250mem.c), however when grub2 is loaded it refuses to recognize UART. On Wed, Mar 1, 2017 at 3:08 PM, Matthias Lange < [email protected]> wrote: > Hi, > > On 03/01/2017 08:00 AM, Andrei Borzenkov wrote: > > please test patches from Matthias Lange > > > > https://lists.gnu.org/archive/html/grub-devel/2017-02/msg00104.html > > > > > > On Wed, Mar 1, 2017 at 9:15 AM, Gailu Singh <[email protected]> wrote: > >> Hi Experts, > >> > >> I am using GRUB2 on intel apollo lake board. This board does not have IO > >> mapped uart instead it has 8250 memory mapped UART. > > Could you share some details about the board? > > >> GRUB2 does not recognize memory mapped uart and gives error ("serial > port > >> COM0 not found). There is a 8250 memory mapped driver available in > coreboot. > >> Is it possible to port that driver to Grub2? > > My patch set adds support for 8250 MMIO PCI cards. Is the UART on your > board connected via PCI? > > Best, > Matthias. >
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