ifdtool uses `chipset` information to determine how certain straps
are decoded. This has been used for IFDv1 platforms as well as IFDv2
platforms (CHIPSET_500_600_SERIES_TIGER_ALDER_POINT).
IFDv2 platforms are all expected to pass in `-p` argument to identify
the platform. This platform information can be used to identify the
appropriate chipset information. For IFDv1 since `-p` argument is not
provided, ifdtool needs to use certain fields in the descriptor
(e.g. strap length) for unique identification of IFDv1 chipset.
This change updates `check_ifd_version()` function to:
1. Determine if IFD version is v1 or v2 based on `-p` argument.
If `-p` is not provided, it assumes that the platform is using IFDv1.
2. Based on IFD version, it calls either `ifd2_platform_to_chipset()`
or `ifd1_guess_chipset()` to determine chipset information.
This fixes the issue reported with CB:44815, where ifdtool is unable
to identify Alder Lake chipsets.
BUG=b:153888802
TEST=Able to dump FD contains correctly with platform quirks on Brya Platform.
> ifdtool -d coreboot.rom -p adl
PCH Revision: 500 series Tiger Point/ 600 series Alder Point
Change-Id: I25f69ce775454409974056d8326c02e29038ec8a
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54305
Reviewed-by: Lean Sheng Tan <lean.sheng.tan@intel.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
On dedede boards without Cr50, the CrOS Board Info (CBI) EEPROM write
protect signal is decoupled from the hardware write protect signal.
Instead, we'd like for it to mirror the software write protect status.
This commit simply checks the software write protect status of the SPI
flash and sets the CBI EEPROM write protect if it's enabled. To prevent
changing the WP signal at run-time, the GPIO configuration is also
locked down after the level has been set. If HW WP is deasserted, the
CBI EEPROM WP will be deasserted as well.
BUG=b:191189275,b:184592299
BRANCH=None
TEST=Build and flash lalala, disable SW WP by running `flashrom -p host
--wp-disable` from a root shell and verify that the GPIO is asserted
after a reboot. Export the gpio via sysfs and verify that attempting to
change the value of the GPIO is futile. Enable SW WP via `flashrom -p
host --wp-enable` and reboot the DUT. Again, export the GPIO via sysfs
and verify that attempts to change the GPIO value are futile.
localhost ~ # iotools mem_read32 0xfd6e08d0
0x44000200
localhost ~ # cd /sys/class/gpio/
localhost /sys/class/gpio # echo 217 > export
localhost /sys/class/gpio # cd gpio217/
localhost /sys/class/gpio/gpio217 # echo out > direction
localhost /sys/class/gpio/gpio217 # cat value
0
localhost /sys/class/gpio/gpio217 # echo 1 > value
localhost /sys/class/gpio/gpio217 # cat value
1
localhost /sys/class/gpio/gpio217 # iotools mem_read32 0xfd6e08d0
0x44000200
Signed-off-by: Aseda Aboagye <aaboagye@google.com>
Change-Id: Ic103037921ec7d2f96f86178675c11a3a1357d1b
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55558
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
This commit adds a method called `mainboard_smi_finalize` which provides
a mechanism for a mainboard to execute some code as part of the finalize
method in the SMM stage before SoC does its finalization.
BUG=b:191189275
BRANCH=None
TEST=Implement `mainboard_smi_finalize` on lalala and verify that the
code executes in SMM.
Signed-off-by: Aseda Aboagye <aaboagye@google.com>
Change-Id: If1ee63431e3c2a5831a4656c3a361229acff3f42
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55649
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
This commit simply adds the offset for the PADCFGLOCK register for the
Intel Jasper Lake platform. This enables pads to be locked.
BUG=b:191189275
BRANCH=None
TEST=Enable pad locking on lalala by calling `gpio_lock_pad` and verify
that the pad configuration is locked and cannot be manipulated from the
OS.
Signed-off-by: Aseda Aboagye <aaboagye@google.com>
Change-Id: Iccfe536b4a881f081f22bcc258a375caad3ffcb3
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55648
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit adds a method for locking a GPIO pad configuration and its
TX state. When the configuration is locked, the following registers
become Read-Only and software writes to these registers have no effect.
Pad Configuration registers
GPI_NMI_EN
GPI_SMI_EN
GPI_GPE_EN
Note that this is only effective if the pad is owned by the host (set in
the PAD_OWN register).
Intel platforms that wish to leverage this function need to define the
PADCFGLOCK offset for their platform.
BUG=b:191189275
BRANCH=None
TEST=With some other code, call gpio_lock_pad() against a pad and verify
that the pad configuration is locked and the state of the pad cannot be
changed from the OS.
Signed-off-by: Aseda Aboagye <aaboagye@google.com>
Change-Id: Id3c0da2f6942099c0289ca1e33a33c176f49d380
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55557
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Per the Intel External Design Specification (doc #618876), the opcode
for GPIO_LOCK_UNLOCK is 0x13. This commit fixes a bug where the opcode
was defined as 13 decimal instead of hexadecimal. Additionally, it
fixes another issue where the `pcr_execute_sideband_msg()` function
doesn't actually write the data when this opcode is selected.
BUG=b:191189275
BRANCH=None
TEST=With additional code that uses this opcode, verify that the lock
functionality works by locking a pad in firmware and attempting to
modify the configuration of the pad from the OS.
Signed-off-by: Aseda Aboagye <aaboagye@google.com>
Change-Id: Ie14fff595474cdfd647c2b36f1eeb5e018f67375
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55556
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
CB:51638 separated Chrome OS NVS from global NVS by allocating it
separately in CBMEM. CNVS is used in depthcharge to fill firmware
information at boot time. Thus, location of CNVS needs to be shared in
coreboot tables for depthcharge to use.
This change adds a new coreboot table tag
`CB_TAG_ACPI_CNVS`/`CB_TAG_ACPI_CNVS`(0x41) which provides the
location of CNVS in CBMEM to payload (depthcharge).
Additionally, CB:51639 refactored device nvs(DNVS) and moved it to the
end of GNVS instead of the fixed offset 0x1000. DNVS is used on older
Intel platforms like baytrail, braswell and broadwell and depthcharge
fills this at boot time as well. Since DNVS is no longer used on any
new platforms, this information is not passed in coreboot
tables. Instead depthcharge is being updated to use statically defined
offsets for DNVS.
BUG=b:191324611, b:191324611
TEST=Verified that `crossystem fwid` which reads fwid information from
CNVS is reported correctly on brya.
Signed-off-by: Furquan Shaikh <furquan@google.com>
Change-Id: I3815d5ecb5f0b534ead61836c2d275083e397ff0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55665
Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com>
Reviewed-by: Ivy Jian <ivy_jian@compal.corp-partner.google.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Since the raw values of the enum elements are used, explicitly assign
the value 0 to the first element to make it clearer that the absolute
values matter here.
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I69f58cca7130ce5f0ebe4743754e4e31f55db289
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55615
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Using existing defines instead of magic values improves readability of
the code. Also add comments to the MADT IRQ overrides to make it clearer
what those actually do.
TEST=Timeless build results in identical binary for amd/gardenia
(Stoneyridge), amd/mandolin (Picasso) and amd/majolica (Cezanne)
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I224ffbe8eb65bcdd5fc70c0ff8b15d55b3f6be01
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55613
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Add mt6691 buck control for DRAM to run fast calibration test.
It is needed to get and set voltage during testing.
Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
Change-Id: I4fb9f7245d44383a6a3a0cf8d00f7f503cbdeb06
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55575
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
To enable display, we have to:
1. Configure panel power and backlight
2. Configure eDP driver
BUG=b:189985956
Signed-off-by: Jitao Shi <jitao.shi@mediatek.com>
Change-Id: Ida6c157a6a3bd904d3fa3dd2001385ced34f7711
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55574
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This patch fixes the storage size to reflect the proper bits instead
of bytes. It was a bug in the initial HEST patch
(https://review.coreboot.org/c/coreboot/+/52090), and commit ID d4db36e672 . Also fixed the
comments to properly reflect the range being used.
Change-Id: I9e968bb09f1c9cd805ff1d0849551b9c2ce2e2b6
Signed-off-by: Rocky Phagura <rphagura@fb.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55393
Reviewed-by: Sumeet R Pawnikar <sumeet.r.pawnikar@intel.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Change the default rom size to 32MB and remove chromeos.fmd
because Chrome OS is not supported on EHL for now.
Signed-off-by: Lean Sheng Tan <lean.sheng.tan@intel.com>
Change-Id: I49d9404eb901087037b5423a4a503c5271e14138
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55554
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Add FSP_ARRAY_LOAD macro for checking and loading array type
configs into array type UPDs to increase readability.
Signed-off-by: Lean Sheng Tan <lean.sheng.tan@intel.com>
Change-Id: Ia20cabcaf9724882c68633eb9b510230e993768c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55560
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Use FSP_ARRAY_LOAD macro for checking and loading array type
configs into array type UPDs to increase readability.
Signed-off-by: Lean Sheng Tan <lean.sheng.tan@intel.com>
Change-Id: I2562977e55f8909038697f7e19b82ec6b5e47fae
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55553
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Add FSP_ARRAY_LOAD macro for checking and loading
array type configs into array type UPDs to increase readability.
Signed-off-by: Lean Sheng Tan <lean.sheng.tan@intel.com>
Change-Id: I307340a2bfc0a54f2ab7241af2f24dfbf8bb111d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55559
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Add EHL under same family tree as TGL & JSL, also fix a
spacing inconsistency line.
Signed-off-by: Lean Sheng Tan <lean.sheng.tan@intel.com>
Change-Id: Ice09861c104c4e339fc83631c75089fa069b3931
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55357
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This patch removes unnecessary __packed attribute from the structure
defined in chip.h
BUG=None
TEST=Tested WFC camera on Brya
Change-Id: I1174606cd22cd353f01d865d0c25bb6f8f8de055
Signed-off-by: Sugnan Prabhu S <sugnan.prabhu.s@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55566
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Varshit B Pandya <varshit.b.pandya@intel.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Due to latest corresponding UPD filling implementation, this is not
required.
This patch fixed the brokenness caused by
Commit hash b10afbd2e2.
Signed-off-by: Bernardo Perez Priego <bernardo.perez.priego@intel.com>
Change-Id: I49e434f7bbafcb148e82202697e87c3e4268d7b1
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55635
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Turn on CBI and add helper functions for determining the board
configuration from the firmware config settings in CBI.
BUG=b:187316460
TEST=Built
Signed-off-by: Martin Roth <martinroth@chromium.org>
Change-Id: I212e7f413b4d8a7d15122cde90100a0ec28e88a6
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54639
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Factoring out those defines brings the Stoneyridge SoC code a bit more
in line with the Cezanne and Picasso SoC code.
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ifba7f13cc926ac28376233aa0bf317164ca9bbd6
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55588
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This change also restores GPIOs to their proper settings for prior board
revs.
BUG=b:189362981
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Change-Id: I89d7ba94dfbd5e4a000cdde7a0c65f38b53b722d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55325
Reviewed-by: Varshit B Pandya <varshit.b.pandya@intel.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
GPP_A19(DP_HPD1) and GPP_A20(DP_HPD2) were configured native function
(NF1), this causes redundancy with legacy HPD interruption.
This change configures GPP_A19 and GPP_A20 to be no connection and
disables DdiPort1Hpd and DdiPort2Hpd.
BUG=None
TEST=Boot to kernel and verified no kernel HPD pins assertion message.
Signed-off-by: Bernardo Perez Priego <bernardo.perez.priego@intel.com>
Change-Id: I80ef40a1aca19cd6ad56219175d2fd40890a393d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55548
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sanrio Alvares <sanrio.alvares@intel.com>
Reviewed-by: Bora Guvendik <bora.guvendik@intel.com>
Configure I2C high / low time in device tree to ensure I2C
CLK runs under I2C_SPEED_FAST (400 kHz).
Touchpad: 387.7kHz
Touchscreen: 389.4kHz
Audio: 387.6kHz
P-sensor: 372.5kHz
BaUG=b:178092096
BRANCH=dedede
TEST=Build and EE check after tuning I2C clock is under 400kHz
Change-Id: I4f6bdd3802cd94671325a89458cde981a2ffa929
Signed-off-by: Tony Huang <tony-huang@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55407
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
google_chromeec_get_event returns an event number and 0 when there's no event.
This function is usually called in a loop until there are no more events, so
it makes sense to return 0 (i.e. no event) when there's an error.
BUG=b:184074997
TEST=Boot guybrush, no ec errors
Change-Id: I6c0186e4637af9ae24f45cce3638f0913227d6a7
Signed-off-by: Rob Barnes <robbarnes@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55437
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
The GPIO_GSC_AP_INT itself is active low, but the payloads will
create the IRQ using its eint driver, which is active high.
BUG=b:188392736
Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Change-Id: Ie39f3b9a5dbe15057ef3e96f6c99211949692003
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55562
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Any chip entry without a device node below them are silently dropped by
sconfig. Copy the same device node from the devicetree to prevent this.
Change-Id: I778f6b2d980e78142ae12ef941e7d9bd1f753057
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55540
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Since the default state of the MMIO UART devices in the chipset
devicetree is off, the mainboard devicetree entries that disable MMIO
UART devices are removed.
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I913a587802020ce4e182b48632cdde1104c2a6e6
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55545
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Defining the memory mapped base in fmap for example "FLASH@0xff800000
0x80000" for a 8M flash is optional in fmap files. This will also
reflect in the generated fmap_config.h. Fix the assembly cbfs walker
walkcbfs.S for fmap lacking a definition of the flash base.
Change-Id: I96b18f675e625abee503648ffdc6031978a4269a
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55452
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michał Żygowski <michal.zygowski@3mdeb.com>
Create the cappy variant of the waddledee reference board by copying
the template files to a new directory named for the variant.
(Auto-Generated by create_coreboot_variant.sh version 4.5.0).
BUG=b:190515828
BRANCH=None
TEST=util/abuild/abuild -p none -t google/dedede -x -a
make sure the build includes GOOGLE_CAPPY
Signed-off-by: Zhi Li <lizhi7@huaqin.corp-partner.google.com>
Change-Id: Id5a3b0cb475ee77a9f62523d8322a5e4123ce3be
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55451
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tao Xia <xiatao5@huaqin.corp-partner.google.com>
Reviewed-by: Weimin Wu <wuweimin@huaqin.corp-partner.google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
devfn_disable() function is used to disable a device based on
given bus, device function number. This function checks if the
device is at enable state and disables the device.
Change-Id: Ia4a8bfec7fc95c729a5bb156f88e9aab3bf5dd41
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55354
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Add camera support in devicetree.
BUG=b:190797339
BRANCH=None.
TEST=built pirika firmware and verified camera function is OK.
Change-Id: I66ded32105f3166e2faec3ea5dcfb93c29822366
Signed-off-by: Alex1 Kao <alex1_kao@pegatron.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55450
Reviewed-by: Kirk Wang <kirk_wang@pegatron.corp-partner.google.com>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
In order to meet timing requirement of WWAN reseting it in early GPIOs
and asserting Reset GPIO in ramstage
BUG=b:180166408
TEST=Build and boot Brya system and verify enumeration of L850 and FM350 devices
Signed-off-by: Varshit Pandya <varshit.b.pandya@intel.com>
Change-Id: Id6d69696b6c645eec3fa314a608c69214bafba82
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54912
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
pmc_set_power_failure_state() is usually called twice, once upon boot
(with `target_on == true`) and once from SMM when the system is shut
down (with `target_on == false`). Assuming settings didn't change
between these calls, there is only one case where we actually need
to write the register value: when updating the state for the
MAINBOARD_POWER_STATE_PREVIOUS feature.
This suits us well as we want to avoid unnecessary writes so we
don't clobber the value set upon boot from within SMM. Due to
inaccessible option backends, SMM might not know the current
option state.
The assumption above, that the option value didn't change, may not
be true if the user changed the option on purpose. In the future,
one would have to reboot the machine for option changes to take
effect. However, this doesn't seem to make a huge difference: One
already needed a controlled shutdown for the update to take effect
before. A reboot doesn't seem much more expensive.
Change-Id: I58dd74b8b073f4f07db090bf7fddb14b5df8239a
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55539
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Angel Pons