Hi Matthias,
The patches I send to the mailing list do not support the Intel UARTs
right now, because they only match for OXSemi IDs. One has to add a
similar matching block to 'ns8250_pci_mmio_iter' for the Intel UARTs.
I have changed the ns8250_pci_mmio_iter and enabled two debug print in
ns8250-pci-mmio.c and I see following prints.
Found Intel PCI UART
bar=c2539004 (MEM, sz=4)
bar=c2539004 (MEM, sz=4)
in my grub.cfg I have
serial --port=pci:0:0 --speed=115200
terminal_input --append serial_pci:0:0
terminal_output --append serial_pci:0:0
But I do not see any output on my serial console. I changed board.base_baud
from 4000000 to 115200. Any other debug print that I could enable to
proceed further on this?
My changed code
-----------------------------------
static int
ns8250_pci_mmio_iter(grub_pci_device_t dev, grub_pci_id_t pciid, void *data)
{
unsigned vendor, device;
struct drv_data *d = (struct drv_data *)data;
if (d->num_ports >= GRUB_SERIAL_PCI_PORT_NUM)
return 0;
vendor = pciid & 0xffff;
device = pciid >> 16;
if (vendor == 0x8086 && device == 0x5ac0)
{
struct grub_serial_port *port = &ports[d->num_ports];
struct grub_serial_board *b = &ports[d->num_ports].board;
if (1)
grub_printf("Found Intel PCI UART\n");
read_bars(dev, b);
port->board.num_ports = 1;
port->board.base_baud = 115200;
port->board.port_offset = 0x200;
port->board.base_offset = 0x1000;
port->pcidev.bus = dev.bus;
port->pcidev.device = dev.device;
port->pcidev.function = dev.function;
port->port_num = 0;
port->card = d->cards;
port->mmio_base = port->board.bars[0].base + port->board.base_offset +
port->port_num * port->board.port_offset;
d->num_ports += 1;
if (d->num_ports >= GRUB_SERIAL_PCI_PORT_NUM)
return 0;
enable_mmio (dev);
d->cards += 1;
}
return 0;
}
-----------------
On Fri, Mar 3, 2017 at 7:11 PM, Matthias Lange <
[email protected]> wrote:
> Hi,
>
> On 03/03/2017 01:03 PM, Gailu Singh wrote:
> > Sorry it took some time to boot board with Linux. Not sure how to
> > determine correct Device ID, Vendor ID seems to be all 8086 on the oard
> > My lspci -nn command output is
> >
> > root@localhost:~# lspci -nn
>
> [...]
>
> > 00:18.0 Signal processing controller [1180]: Intel Corporation Device
> > [8086:5abc] (rev 0b)
> > 00:18.1 Signal processing controller [1180]: Intel Corporation Device
> > [8086:5abe] (rev 0b)
> > 00:18.2 Signal processing controller [1180]: Intel Corporation Device
> > [8086:5ac0] (rev 0b)
> > 00:18.3 Signal processing controller [1180]: Intel Corporation Device
> > [8086:5aee] (rev 0b)
>
> These four devices are the HSUARTs (high speed UART). According to the
> documentation they are 16550A compatible UARTs.
>
> [...]
>
> The patches I send to the mailing list do not support the Intel UARTs
> right now, because they only match for OXSemi IDs. One has to add a
> similar matching block to 'ns8250_pci_mmio_iter' for the Intel UARTs.
>
> First I need to have a look into the Linux driver to get more insights.
> If I am lucky we also might have a board with an Intel Quark SoC flying
> around in the office.
>
> Best,
> Matthias.
>
> >
> > In coreboot it initializes as
> >
> > 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);
> > }
> > }
> >
> > #define PCIE_MMIO(Bus, Device, Function, Register ) \
> > ( (UINTN)CONFIG_MMCONF_BASE_ADDRESS + \
> > (UINTN)(Bus << 20) + \
> > (UINTN)(Device << 15) + \
> > (UINTN)(Function << 12) + \
> > (UINTN)(Register) \
> > )
> >
> >
> > #define PCH_DEV_SLOT_UART0x18
> >
> > There are 4 uarts (idx 0 to 3)
> >
> > Is above information sufficient to find the required information?
> >
> > On Wed, Mar 1, 2017 at 4:34 PM, Gailu Singh <[email protected]
> > <mailto:[email protected]>> wrote:
> >
> > Build problem was due to not running ./configure. I only did make
> > clean and make. Build issue is now resolved after running
> > configure. Only cosmetic change in your patch.
> >
> > =============
> > static void
> > read_bars(grub_pci_device_t dev, struct grub_serial_board *board)
> > {
> > for (unsigned bar = 0; bar < NUM_BARS; ++bar)
> >
> > changed to
> > =============
> > static void
> > read_bars(grub_pci_device_t dev, struct grub_serial_board *board)
> > {
> > unsigned bar;
> >
> > for (bar = 0; bar < NUM_BARS; ++bar)
> > ============
> >
> > I was getting error for C99 enforcement error during build(‘for’
> > loop initial declarations are only allowed in C99 mode)
> >
> >
> > I will check PCI vendor ID and Device ID and get back to you.
> >
> >
> >
> > On Wed, Mar 1, 2017 at 4:27 PM, Matthias Lange
> > <[email protected]
> > <mailto:[email protected]>> wrote:
> >
> > On 03/01/2017 11:32 AM, Gailu Singh wrote:
> > > 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);
> > > }
> > > }
> > > ---------
> >
> > This looks promising. Could you extract the PCI vendor and
> device ID
> > please? My current implementation currently only supports OXSemi
> > chips.
> >
> > > 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
> > > ------------------------
> >
> > Hmmm, grub_ns8250_pci_mmio_init is defined in
> include/grub/serial.h.
> > Could you check that please? I failed to reproduce your problem,
> > maybe I
> > did something different?
> >
> > (master checked out)
> > /tmp/grub $ /path/to/grub-src/configure --with-platform=efi
> > /tmp/grub $ make -j12 # success
> > (applied my three patches)
> > /tmp/grub $ make clean
> > /tmp/grub $ make -j12 # success
> >
> > Matthias.
> >
> > > On Wed, Mar 1, 2017 at 3:27 PM, Gailu Singh <[email protected]
> <mailto:[email protected]>
> > > <mailto:[email protected] <mailto:[email protected]>>> wrote:
> > >
> > > Sorry for typo. I meant 8250 instead of 8050 in last email
> > >
> > > On Wed, Mar 1, 2017 at 3:21 PM, Gailu Singh <
> [email protected] <mailto:[email protected]>
> > > <mailto:[email protected] <mailto:[email protected]>>>
> 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/coreboot/blob/master/src/
> drivers/uart/uart8250mem.c
> > <https://github.com/coreboot/coreboot/blob/master/src/
> drivers/uart/uart8250mem.c>
> > >
> > <https://github.com/coreboot/coreboot/blob/master/src/
> drivers/uart/uart8250mem.c
> > <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]
> > <mailto:[email protected]>
> > > <mailto:[email protected]
> > <mailto:[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
> > <https://lists.gnu.org/archive/html/grub-devel/2017-
> 02/msg00104.html>
> > > <https://lists.gnu.org/
> archive/html/grub-devel/2017-02/msg00104.html
> > <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] <mailto:[email protected]>
> > <mailto:[email protected] <mailto:[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.
>
>
> --
> Matthias Lange, [email protected], +49-351-41 888 614
>
> Kernkonzept GmbH. Sitz: Dresden. Amtsgericht Dresden, HRB 31129.
> Geschäftsführer: Dr.-Ing. Michael Hohmuth
>
>
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