Sorry for late reply...
May I ask you to send the patches using "git send-email"?
On Fri, Aug 26, 2022 at 01:01:44PM +0200, pet...@infradead.org wrote:
> Loosely based on early_pci_serial_init() from Linux, allow GRUB to make
> use of PCI serial devices.
>
> Specifically, my Alderlake NUC exposes the Intel AMT SoL UART as a PCI
> enumerated device but doesn't include it in the EFI tables.
>
> Tested and confirmed working on a "Lenovo P360 Tiny" with Intel AMT
> enabled. This specific machine has (from lspci -vv):
>
> 00:16.3 Serial controller: Intel Corporation Device 7aeb (rev 11) (prog-if 02
> [16550])
> DeviceName: Onboard - Other
> Subsystem: Lenovo Device 330e
> Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr-
> Stepping- SERR- FastB2B- DisINTx-
> Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort-
> <TAbort- <MAbort- >SERR- <PERR- INTx-
> Interrupt: pin D routed to IRQ 19
> Region 0: I/O ports at 40a0 [size=8]
> Region 1: Memory at b4224000 (32-bit, non-prefetchable) [size=4K]
> Capabilities: [40] MSI: Enable- Count=1/1 Maskable- 64bit+
> Address: 0000000000000000 Data: 0000
> Capabilities: [50] Power Management version 3
> Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA
> PME(D0-,D1-,D2-,D3hot-,D3cold-)
> Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
> Kernel driver in use: serial
>
> >From which the following config (/etc/default/grub) gets a working
> serial setup:
>
> GRUB_CMDLINE_LINUX="console=tty0 earlyprintk=pciserial,00:16.3,115200
> console=ttyS0,115200"
> GRUB_SERIAL_COMMAND="serial --port=0x40a0 --speed=115200"
Please add a blurb how to use this driver to the docs/grub.texi file.
> GRUB_TERMINAL="serial console"
>
> Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org>
> ---
>
> Index: grub/grub-core/Makefile.core.def
> ===================================================================
> --- grub.orig/grub-core/Makefile.core.def
> +++ grub/grub-core/Makefile.core.def
> @@ -2047,6 +2047,7 @@ module = {
> ieee1275 = term/ieee1275/serial.c;
> mips_arc = term/arc/serial.c;
> efi = term/efi/serial.c;
> + pci = term/pci/serial.c;
I think this should be "x86 = term/pci/serial.c".
>
> enable = terminfomodule;
> enable = ieee1275;
> Index: grub/grub-core/term/pci/serial.c
> ===================================================================
> --- /dev/null
> +++ grub/grub-core/term/pci/serial.c
> @@ -0,0 +1,95 @@
> +/*
> + * GRUB -- GRand Unified Bootloader
> + * Copyright (C) 2022 Free Software Foundation, Inc.
> + *
> + * GRUB is free software: you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation, either version 3 of the License, or
> + * (at your option) any later version.
> + *
> + * GRUB is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <grub/serial.h>
> +#include <grub/term.h>
> +#include <grub/types.h>
> +#include <grub/pci.h>
> +#include <grub/mm.h>
> +#include <grub/misc.h>
> +
> +static int
> +find_pciserial (grub_pci_device_t dev, grub_pci_id_t pciid, void *data)
grub_pci_id_t pciid __attribute__ ((unused))
> +{
> + grub_pci_address_t cmd_addr, class_addr, bar_addr;
> + struct grub_serial_port *port;
> + grub_uint32_t class, bar;
> + grub_uint16_t cmdreg;
> + int *port_num = data;
> + grub_err_t err;
> +
> + (void)pciid;
... and please drop this...
> + cmd_addr = grub_pci_make_address (dev, GRUB_PCI_REG_COMMAND);
> + cmdreg = grub_pci_read (cmd_addr);
> +
> + class_addr = grub_pci_make_address (dev, GRUB_PCI_REG_REVISION);
> + class = grub_pci_read (class_addr);
> +
> + bar_addr = grub_pci_make_address (dev, GRUB_PCI_REG_ADDRESS_REG0);
> + bar = grub_pci_read (bar_addr);
> +
> + /* 16550 compattible MODEM or SERIAL */
> + if (((class >> 16) != GRUB_PCI_CLASS_COMMUNICATION_MODEM &&
> + (class >> 16) != GRUB_PCI_CLASS_COMMUNICATION_SERIAL) ||
> + ((class >> 8) & 0xff) != GRUB_PCI_SERIAL_16550_COMPATIBLE)
> + return 0;
> +
> + if ((bar & GRUB_PCI_ADDR_SPACE_MASK) != GRUB_PCI_ADDR_SPACE_IO)
> + return 0;
> +
> + port = grub_zalloc (sizeof (*port));
> + if (port == NULL)
> + return 0;
> +
> + port->name = grub_xasprintf ("pci%d", (*port_num));
> + if (port->name == NULL)
> + goto error;
> +
> + grub_pci_write (cmd_addr, cmdreg | GRUB_PCI_COMMAND_IO_ENABLED);
> +
> + port->driver = &grub_ns8250_driver;
> + port->port = bar & GRUB_PCI_ADDR_IO_MASK;
> + err = grub_serial_config_defaults (port);
> + if (err != GRUB_ERR_NONE)
> + {
> + grub_print_error ();
> + goto error;
> + }
> +
> + err = grub_serial_register (port);
> + if (err != GRUB_ERR_NONE)
> + goto error;
> +
> + (*port_num)++;
> +
> + return 0;
> +
> +error:
s/error/fail/
And please add a space before label...
> + grub_free (port->name);
> + grub_free (port);
> + return 0;
> +}
Daniel
_______________________________________________
Grub-devel mailing list
Grub-devel@gnu.org
https://lists.gnu.org/mailman/listinfo/grub-devel
