tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1# SPDX-License-Identifier: GPL-2.0-only
2menuconfig GOOGLE_FIRMWARE
3 bool "Google Firmware Drivers"
4 default n
5 help
6 These firmware drivers are used by Google servers,
7 Chromebooks and other devices using coreboot firmware.
8 If in doubt, say "N".
9
10if GOOGLE_FIRMWARE
11
12config GOOGLE_SMI
13 tristate "SMI interface for Google platforms"
14 depends on X86 && ACPI && DMI
15 help
16 Say Y here if you want to enable SMI callbacks for Google
17 platforms. This provides an interface for writing to and
18 clearing the event log. If CONFIG_EFI is also enabled this
19 driver provides an interface for reading and writing NVRAM
20 variables.
21
22config GOOGLE_CBMEM
23 tristate "CBMEM entries in sysfs"
24 depends on GOOGLE_COREBOOT_TABLE
25 help
26 CBMEM is a downwards-growing memory region created by the
27 Coreboot BIOS containing tagged data structures from the
28 BIOS. These data structures expose things like the verified
29 boot firmware variables, flash layout, firmware event log,
30 and more.
31
32 This option enables the cbmem module, which causes the
33 kernel to search for Coreboot CBMEM entries, and expose the
34 memory for each entry in sysfs under
35 /sys/bus/coreboot/devices/cbmem-<id>.
36
37config GOOGLE_COREBOOT_TABLE
38 tristate "Coreboot Table Access"
39 depends on HAS_IOMEM && (ACPI || OF)
40 help
41 This option enables the coreboot_table module, which provides other
42 firmware modules access to the coreboot table. The coreboot table
43 pointer is accessed through the ACPI "GOOGCB00" object or the
44 device tree node /firmware/coreboot.
45 If unsure say N.
46
47config GOOGLE_COREBOOT_TABLE_ACPI
48 tristate
49 select GOOGLE_COREBOOT_TABLE
50
51config GOOGLE_COREBOOT_TABLE_OF
52 tristate
53 select GOOGLE_COREBOOT_TABLE
54
55config GOOGLE_MEMCONSOLE
56 tristate
57 depends on GOOGLE_MEMCONSOLE_X86_LEGACY || GOOGLE_MEMCONSOLE_COREBOOT
58
59config GOOGLE_MEMCONSOLE_X86_LEGACY
60 tristate "Firmware Memory Console - X86 Legacy support"
61 depends on X86 && ACPI && DMI
62 select GOOGLE_MEMCONSOLE
63 help
64 This option enables the kernel to search for a firmware log in
65 the EBDA on Google servers. If found, this log is exported to
66 userland in the file /sys/firmware/log.
67
68config GOOGLE_FRAMEBUFFER_COREBOOT
69 tristate "Coreboot Framebuffer"
70 depends on FB_SIMPLE
71 depends on GOOGLE_COREBOOT_TABLE
72 help
73 This option enables the kernel to search for a framebuffer in
74 the coreboot table. If found, it is registered with simplefb.
75
76config GOOGLE_MEMCONSOLE_COREBOOT
77 tristate "Firmware Memory Console"
78 depends on GOOGLE_COREBOOT_TABLE
79 select GOOGLE_MEMCONSOLE
80 help
81 This option enables the kernel to search for a firmware log in
82 the coreboot table. If found, this log is exported to userland
83 in the file /sys/firmware/log.
84
85config GOOGLE_VPD
86 tristate "Vital Product Data"
87 depends on GOOGLE_COREBOOT_TABLE
88 help
89 This option enables the kernel to expose the content of Google VPD
90 under /sys/firmware/vpd.
91
92endif # GOOGLE_FIRMWARE