I checked coreboot where in the memory it is mapped and it seems to be on
PCIE. Relevant code from coreboot. So I am hopeful that patch will work.
---------
uintptr_t uart_platform_base(int idx)
{
u8 *pcie;
u32 tmp;
idx = idx & 3;
pcie = (u8 *)PCIE_MMIO(0, PCH_DEV_SLOT_UART, idx, 0);
tmp = read32 (pcie + PCI_BASE_ADDRESS_0);
if (tmp == 0xFFFFFFFF) {
/* the device might be hidden */
return LPSS_UART_BASE_ADDRESS;
} else {
return (uintptr_t) (tmp & 0xFFFFFFF0);
}
}
---------
I applied the patches and run make clean followed by make but build failed
as follows
------------------------
cat syminfo.lst | sort | gawk -f ./genmoddep.awk > moddep.lst || (rm -f
moddep.lst; exit 1)
grub_ns8250_pci_mmio_init in serial is not defined
make[3]: *** [moddep.lst] Error 1
------------------------
On Wed, Mar 1, 2017 at 3:27 PM, Gailu Singh <gail...@gmail.com> wrote:
> Sorry for typo. I meant 8250 instead of 8050 in last email
>
> On Wed, Mar 1, 2017 at 3:21 PM, Gailu Singh <gail...@gmail.com> wrote:
>
>> 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/c
>> oreboot/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 <
>> matthias.la...@kernkonzept.com> 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 <gail...@gmail.com> 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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