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diff --git a/docs/fingerprint/fingerprint.md b/docs/fingerprint/fingerprint.md deleted file mode 100644 index 39785f5afb..0000000000 --- a/docs/fingerprint/fingerprint.md +++ /dev/null @@ -1,590 +0,0 @@ -# Fingerprint Firmware (FPMCU) - -[TOC] - -<!-- mdformat off(b/139308852) --> -*** note -NOTE: The build commands assume you are in the `~/trunk/src/platform/ec` -directory inside the chroot. -*** -<!-- mdformat on --> - -<!-- mdformat off(b/139308852) --> -*** note -WARNING: When switching branches in the EC codebase, you probably want to nuke -the `build` directory or at least the board you're working on: `rm -rf -build/<board>` or `make clobber` to prevent compilation errors. -*** -<!-- mdformat on --> - -## Software - -The main source code for fingerprint sensor functionality lives in the -[`common/fpsensor`] directory. The driver code for specific sensors lives in the -[`driver/fingerprint`] directory. - -## Hardware {#hardware} - -The following "boards" (specified by the `BOARD` environment variable when -building the EC code) are for fingerprint: - -MCU | Sensor | Firmware (EC "board") | Dev Board | Nucleo Board ----------------------- | ---------- | ---------------------------------------------- | -------------------------------------------- | ------------ -[STM32H743] \(Cortex-M7) | [FPC 1145] | `dartmonkey`<br>(aka `nocturne_fp`, `nami_fp`) | [Icetower v0.2] <br>(Previously Dragontalon) | [Nucleo H743ZI2] -[STM32F412] \(Cortex-M4) | [FPC 1025] | `bloonchipper`<br>(aka `hatch_fp`) | [Dragonclaw v0.2] | [Nucleo F412ZG] - -### Sensor Template Sizes - -Sensor | Fingerprint Template Size ----------- | -------------------------------- -[FPC 1145] | [~48 KB][FPC 1145 Template Size] -[FPC 1025] | [~5 KB][FPC 1025 Template Size] - -### Determining Hardware {#chromeos-config-fingerprint} - -If you have access to a shell on your Chromebook, you can use [Chrome OS Config] -to determine the FPMCU that it contains: - -```bash -(dut) $ cros_config /fingerprint board -``` - -Alternatively, if you have a Chromium OS build, you can use [Chrome OS Config] -in the chroot to determine the FPMCU: - -```bash -(chroot) $ cros_config_host -c /build/<BOARD>/usr/share/chromeos-config/yaml/config.yaml -m <MODEL> get /fingerprint board -``` - -<!-- mdformat off(b/139308852) --> -*** note -**NOTE**: If you get an empty response when running these commands, the -[Chrome OS Config] properties for fingerprint may not have been set up yet. See -the [section on updating Chrome OS Config](#update-chromeos-config). -*** -<!-- mdformat on --> - -## Building FPMCU Firmware Locally - -### See `Makefile` target options - -```bash -(chroot) ~/trunk/src/platform/ec $ make help -``` - -### Build - -Replace `<BOARD_NAME>` in the command below with the fingerprint MCU that you -are targeting (e.g., `nocturne_fp`, `dartmonkey`, `bloonchipper`). - -```bash -(chroot) ~/trunk/src/platform/ec $ make BOARD=<BOARD_NAME> -j -``` - -### Verbose Build output - -Use `V=1` to see the complete compiler output (all flags). - -```bash -(chroot) ~/trunk/src/platform/ec $ make V=1 BOARD=nocturne_fp -j -``` - -## Building all EC firmware (before "repo upload") - -Before uploading a change to Gerrit via `repo upload`, you'll need to build -*all* the boards in the EC codebase to make sure your changes do not break any -others. - -<!-- mdformat off(b/139308852) --> -*** note -NOTE: If you forget to do this, do not worry. `repo upload` will warn you and -prevent you from uploading. -*** -<!-- mdformat on --> - -```bash -(chroot) ~/trunk/src/platform/ec $ make buildall -j -``` - -## Building and running unit tests - -See the [Unit Tests] documentation for details on how to [run the unit tests]. - -## Build ectool - -```bash -(chroot) ~/trunk/src/platform/ec $ make BOARD=nocturne_fp utils-host -j -``` - -## Build and run the `host_command` fuzz test - -```bash -(chroot) ~/trunk/src/platform/ec $ make run-host_command_fuzz -``` - -## Logs - -[`timberslide`] is a simple daemon that collects logs from the FPMCU and writes -them to disk. [`timberslide`] reads from sysfs, where the kernel driver -[periodically dumps the FPMCU console output][cros_ec_debugfs]. [`timberslide`] -writes the resulting logs to `/var/log/cros_fp.log`. There are multiple -instances of [`timberslide`] that run; one for each MCU running the EC codebase. - -### Starting timberslide - -```bash -(dut)$ start timberslide LOG_PATH=/sys/kernel/debug/cros_fp/console_log -``` - -### Stopping timberslide - -```bash -(dut)$ stop timberslide LOG_PATH=/sys/kernel/debug/cros_fp/console_log -``` - -### Manually running timberslide - -```bash -(dut)$ timberslide --device_log=/sys/kernel/debug/cros_fp/console_log -``` - -### Reading logs from kernel - -If [`timberslide`] is not running you can just `cat` the logs directly from the -kernel: - -```bash -(dut)$ cat /sys/kernel/debug/cros_fp/console_log -``` - -## Production Updates (Auto-Update) - -### `fp_updater.sh` and `bio_fw_updater` - -<!-- mdformat off(b/139308852) --> -*** note -**NOTE**: The auto-update process requires a working version of the firmware -running on the FPMCU. See [Fingerprint Factory Requirements] for details on -flashing in the factory. -*** -<!-- mdformat on --> - -[`fp_updater.sh`] and [`bio_fw_updater`] are wrappers around [`flashrom`] and -require already-functioning RO firmware running on the FPMCU. It’s meant to be -used in production to update the RW firmware. `fp_updater.sh` was used prior to -M77; `bio_fw_updater` replaces it. - -It's also possible to use the updater to update the RO firmware if you disable -*both* HW and SW write protect, which we use for updating development devices -that do not have write protect enabled (dogfood devices, EVT, etc.) - -In production, only the RW portion of the firmware can be updated (unless the -user disables [hardware write protection]). - -## Factory / RMA / Development Updates {#factory-rma-dev-updates} - -### `flash_fp_mcu` - -<!-- mdformat off(b/139308852) --> -*** note -**NOTE**: This tool is really just for us to use during development or during -the RMA flow (must go through finalization again in that case). We never update -RO in the field (can’t by design). See [Fingerprint Factory Requirements] for -details on flashing in the factory. -*** -<!-- mdformat on --> - -[`flash_fp_mcu`] enables spidev and toggles some GPIOs to put the FPMCU (STM32) -into bootloader mode. At that point it uses [`stm32mon`] to rewrite the entire -flash (both RO and RW). The FPMCU can only be put into bootloader mode when -[hardware write protection] is disabled, which means [`flash_fp_mcu`] can only -be used when [hardware write protection] is disabled. - -[`flash_fp_mcu`] is available in the [Chromium OS test image]. - -### `stm32mon` - -[`stm32mon`] is a tool used to send commands to the STM32 bootloader. We use it -for development (through [`flash_fp_mcu`]) to erase and flash the entire chip. - -[`stm32mon`] is available in the [Chromium OS test image]. - -## Keys - -The `RO` section of the fingerprint firmware contains the public portion of the -key used to sign the RW firmware. The RO firmware uses the public key to -validate the signature of the RW firmware before jumping to it. It is not -possible to update the public key stored in the RO firmware once a device has -been shipped (i.e., once [hardware write protection] is enabled). - -Different keys are used to sign the firmware during development and production. -The `dev` key is used for local builds and development and is not private; it is -called `dev_key.pem` and located in the "board" directory for the given FPMCU -(e.g., [`board/nocturne_fp/dev_key.pem`]). After doing a build, the `ec.bin` in -the `build` directory (e.g., `build/nocturne_fp/ec.bin`) will be signed with the -`dev` key. - -The two other types of keys are `premp` and `mp`, which stand for "pre-mass -production" and "mass production", respectively. Both the `premp` and `mp` keys -are only available to the buildbots as part of the official build. The `premp` -is typically used during bringup of new hardware to validate the signing flow of -the buildbots, while the `mp` key is used for PVT and production devices. - -Switching keys is only possible when the `RO` firmware is not write protected, -since the public portion of the keypair is stored in the `RO` firmware. - -### Generate Key - -For testing, you can generate a new key by using the following openssl command: - -```bash -openssl genrsa -3 -out board/$BOARD/dev_key.pem 3072 -``` - -### Resources - -* https://sites.google.com/a/google.com/chromeos/resources/engineering/releng/signer-documentation -* https://sites.google.com/a/google.com/chromeos/paygen---payload -* https://b.corp.google.com/issues/77882970 - -## Signing - -[`futility`] is used to sign EC firmware. There’s a wrapper script around it for -signing called [`sign_official_build.sh`]. - -### Key ID - -The output of `futility show` will show a `Public Key File` and `Signature` -section, each of which have an `ID` field. This ID lets you match the key to the -signature in case there is more than one. -[It’s just a sha1sum of the public key,][vboot_key_id] so it lets you -[uniquely identify the key being used][vb2_public_key]. - -If you have the key (e.g., in PEM format), you can compute the `ID` with the -`futility show` command: - -```bash -(chroot) $ futility show ./path/to/key.pem -``` - -#### Example - -If you are building the `hatch_fp` "board" on your local machine (which signs -the resulting `ec.bin` with the `dev` key, you can check the `ID` with: - -```bash -(chroot)$ futility show board/hatch_fp/dev_key.pem -``` - -``` -Private Key file: board/hatch_fp/dev_key.pem - Key length: 3072 - Key sha1sum: 61382804da86b4156d666cc9a976088f8b647d44 -``` - -```bash -(chroot)$ futility show build/hatch_fp/ec.bin -``` - -``` -Public Key file: build/hatch_fp/ec.bin - Vboot API: 2.1 - Desc: "" - Signature Algorithm: 7 RSA3072EXP3 - Hash Algorithm: 2 SHA256 - Version: 0x00000001 - ID: 61382804da86b4156d666cc9a976088f8b647d44 -Signature: build/hatch_fp/ec.bin - Vboot API: 2.1 - Desc: "" - Signature Algorithm: 7 RSA3072EXP3 - Hash Algorithm: 2 SHA256 - Total size: 0x1b8 (440) - ID: 61382804da86b4156d666cc9a976088f8b647d44 - Data size: 0x2864c (165452) -Signature verification succeeded. -``` - -### Showing Key ID (fingerprint) for running FW - -[Asked on chromeos-chatty-firmware][chatty-firmware-q] about adding an EC -command to show the Key ID (fingerprint) from the RO version. This would make it -a lot easier during both development and testing. - -## Power - -See [Measuring Power] for instructions on how to measure power with the -fingerprint development boards. - -### Dragonclaw v0.2 - -```bash -(chroot) $ dut-control -t 60 pp3300_dx_mcu_mv pp3300_dx_fp_mv pp1800_dx_fp_mv pp3300_dx_mcu_mw pp3300_dx_fp_mw pp1800_dx_fp_mw -``` - -**Firmware Version**: -`bloonchipper_v2.0.4277-9f652bb3-RO_v2.0.7314-3dfc5ff6-RW.bin` - -#### MCU is idle - -``` -(chroot) $ dut-control fpmcu_slp_alt:off -``` - -``` -@@ NAME COUNT AVERAGE STDDEV MAX MIN -@@ sample_msecs 113 533.56 40.91 658.52 447.06 -@@ pp1800_dx_fp_mv 113 1800.00 0.00 1800.00 1800.00 -@@ pp1800_dx_fp_mw 113 0.00 0.00 0.00 0.00 -@@ pp3300_dx_fp_mv 113 3280.00 0.00 3280.00 3280.00 -@@ pp3300_dx_fp_mw 113 0.01 0.05 0.26 0.00 -@@ pp3300_dx_mcu_mv 113 3280.00 0.00 3280.00 3280.00 -@@ pp3300_dx_mcu_mw 113 24.67 0.00 24.67 24.67 -``` - -#### MCU in low power mode (suspend) - -``` -(chroot) $ dut-control fpmcu_slp_alt:on -``` - -``` -@@ NAME COUNT AVERAGE STDDEV MAX MIN -@@ sample_msecs 115 526.56 36.79 607.60 426.58 -@@ pp1800_dx_fp_mv 115 1800.00 0.00 1800.00 1800.00 -@@ pp1800_dx_fp_mw 115 0.00 0.00 0.00 0.00 -@@ pp3300_dx_fp_mv 115 3287.30 2.25 3288.00 3280.00 -@@ pp3300_dx_fp_mw 115 0.00 0.02 0.26 0.00 -@@ pp3300_dx_mcu_mv 115 3280.97 2.62 3288.00 3280.00 -@@ pp3300_dx_mcu_mw 115 4.02 0.64 10.76 3.94 -``` - -### Icetower v0.1 - -<!-- mdformat off(b/139308852) --> -*** note -**NOTE**: Icetower v0.1 has a hardware bug in the INA connections, so you cannot -measure the 1.8V fingerprint sensor rail. See http://b/178098140. - -Additionally, before https://crrev.com/c/2689101, the sleep GPIOs were not -configured correctly, so the change needs to be cherry-picked in order to -measure releases before that point. -*** -<!-- mdformat on --> - -```bash -(chroot) $ dut-control -t 60 pp3300_dx_mcu_mv pp3300_dx_fp_mv pp3300_dx_mcu_mw pp3300_dx_fp_mw -``` - -**Firmware Version**: -`dartmonkey_v2.0.2887-311310808-RO_v2.0.7304-441100b93-RW.bin` - -#### MCU is idle - -``` -(chroot) $ dut-control fpmcu_slp_alt:off -``` - -``` -@@ NAME COUNT AVERAGE STDDEV MAX MIN -@@ sample_msecs 178 337.13 20.91 404.32 289.82 -@@ pp3300_dx_fp_mv 178 3256.00 0.00 3256.00 3256.00 -@@ pp3300_dx_fp_mw 178 0.00 0.00 0.00 0.00 -@@ pp3300_dx_mcu_mv 178 3248.00 0.00 3248.00 3248.00 -@@ pp3300_dx_mcu_mw 178 45.17 0.09 45.21 44.95 -``` - -#### MCU in low power mode (suspend) - -``` -(chroot) $ dut-control fpmcu_slp_alt:on -``` - -``` -@@ NAME COUNT AVERAGE STDDEV MAX MIN -@@ sample_msecs 174 345.60 31.93 457.62 283.00 -@@ pp3300_dx_fp_mv 174 3264.00 0.00 3264.00 3264.00 -@@ pp3300_dx_fp_mw 174 0.00 0.00 0.00 0.00 -@@ pp3300_dx_mcu_mv 174 3260.69 3.94 3264.00 3256.00 -@@ pp3300_dx_mcu_mw 174 5.47 0.10 5.48 4.17 -``` - -## Chrome OS Build (portage / ebuild) - -In order to use the fingerprint sensor with a given [Chrome OS board], a few -things need to be configured for the [Chrome OS board]. - -### Enable biod USE flag - -The biod [`USE` flag] needs to be enabled for the [Chrome OS board]. This `USE` -flag -[determines whether the `biod` daemon is built and installed][biod chromium-os]. - -To enable the `USE` flag, update the `make.defaults` for the [Chrome OS board]. -See the [`make.defaults` for the Hatch board][hatch make.defaults] as an -example. - -#### Verifying biod is installed in the rootfs - -After enabling the `biod` [`USE` flag] and building the `biod` package for your -target [Chrome OS board], the `biod` binary should be in the build directory: - -```bash -(chroot) $ emerge-<BOARD> biod -``` - -```bash -(chroot) $ ls /build/<BOARD>/usr/bin/biod -/build/<BOARD>/usr/bin/biod -``` - -### Update FPMCU_FIRMWARE - -`FPMCU_FIRMWARE` should be set to the set of fingerprint firmware that should be -built and installed for the [Chrome OS board]. - -`FPMCU_FIRMWARE` is a [`USE_EXPAND` variable][`USE` flag], -[defined in the base `make.defaults`][FPMCU_FIRMWARE make.defaults]. - -The `biod` ebuild uses the resulting [`USE` flags] to -[determine which FPMCU release firmware to build][biod release firmware] and the -[`chromeos-firmware-fpmcu` ebuild] uses the resulting [`USE` flags] to -[determine which firmware to install][firmware ebuild] to the rootfs in -`/opt/google/biod/fw`. - -Possible values for `FPMCU_FIRMWARE` can be found by looking at the -`FIRMWARE_EC_BOARD` values in the [`chromeos-fpmcu-release*` ebuilds], which -correspond to the [FPMCU hardware](#hardware). - -See the [Hatch baseboard `make.defaults`] for an example. - -#### Verifying FPMCU firmware is installed in the rootfs - -Once you have added the `FPMCU_FIRMWARE` flag and rebuilt the -[`chromeos-firmware-fpmcu` ebuild], the firmware will show up in the the chroot: - -<!-- mdformat off(b/139308852) --> -*** note -**NOTE**: This requires access to the [internal manifest]. -*** -<!-- mdformat on --> - -```bash -(chroot) $ emerge-<BOARD> chromeos-firmware-fpmcu -``` - -```bash -(chroot) $ ls /build/<BOARD>/opt/google/biod/fw -bloonchipper_v2.0.2626-3c315108.bin dartmonkey_v2.0.2887-311310808.bin -``` - -The above output assumes you selected the `bloonchipper` and `dartmonkey` -firmware by setting `FPMCU_FIRMWARE="bloonchipper dartmonkey"`. The actual -version numbers displayed will not necessarily match since the firmware is -constantly updated. - -### Update Chrome OS Config {#update-chromeos-config} - -With "unibuild", the same OS image (build) for a given [Chrome OS board] is used -across multiple devices. Often there will be some devices that have a -fingerprint sensor, some that do not, and even different sensors for the same -board. - -Determining what fingerprint hardware is on a given [Chrome OS board] is thus -done at runtime, using [Chrome OS Config]. - -The `fingerprint` config needs to be in the `model.yaml` for the given -[Chrome OS board]. The [Chrome OS Config fingerprint] section describes the -attributes for the `fingerprint` config in more detail. - -The [`ec_extras` attribute] needs to be set to the list of fingerprint firmware -that should be built as part of the build. - -See the [`model.yaml` for the Hatch board][hatch model.yaml] as an example. - -Instead of crafting the `model.yaml` by hand, newer boards are moving to the -[Chrome OS Project Configuration] model, where the config is generated using -[Starlark]. The common [`create_fingerprint`] function can be used across models -to configure the fingerprint settings. See the [Morphius `config.star`] for an -example of how to call `create_fingerprint`. After you modify a `config.star` -file you will need to [regenerate the config]. If you need to change many -projects (e.g., modifying [`create_fingerprint`]), you can use the [`CLFactory`] -tool. - -Once you have updated the config, you can test your changes by -[running `cros_config`](#chromeos-config-fingerprint). The Chrome OS Config -documentation has a [section on testing properties] that describes this in more -detail. - -### SKUs - -The fingerprint sensor may only be included on certain SKUs for a given device. -The fingerprint code uses [Chrome OS Config] to determine whether a device has a -fingerprint sensor or not. For each SKU, there is an associated -[fingerprint config][Chrome OS Config fingerprint]. [Chrome OS Config] -determines the [SKU information][Chrome OS Config SKU] (and thus the -[fingerprint config][Chrome OS Config fingerprint]) from [CBI Info]. The SKU for -a given device can be found by viewing `chrome://system/#platform_identity_sku`. - -[`common/fpsensor`]: https://chromium.googlesource.com/chromiumos/platform/ec/+/HEAD/common/fpsensor/ -[`driver/fingerprint`]: https://chromium.googlesource.com/chromiumos/platform/ec/+/HEAD/driver/fingerprint -[`nocturne_fp`]: https://chromium.googlesource.com/chromiumos/platform/ec/+/HEAD/board/nocturne_fp/ -[`nami_fp`]: https://chromium.googlesource.com/chromiumos/platform/ec/+/HEAD/board/nami_fp/ -[`hatch_fp`]: https://chromium.googlesource.com/chromiumos/platform/ec/+/HEAD/board/hatch_fp/ -[`bloonchipper`]: https://chromium.googlesource.com/chromiumos/platform/ec/+/HEAD/board/bloonchipper/ -[`dartmonkey`]: https://chromium.googlesource.com/chromiumos/platform/ec/+/HEAD/board/dartmonkey/ -[hardware write protection]: ../write_protection.md -[`flash_fp_mcu`]: https://chromium.googlesource.com/chromiumos/platform/ec/+/HEAD/util/flash_fp_mcu -[`stm32mon`]: https://chromium.googlesource.com/chromiumos/platform/ec/+/e1f3f89e7ea7945adddd0c2e6838f5e59856cff2/util/stm32mon.c#14 -[`futility`]: https://chromium.googlesource.com/chromiumos/platform/vboot_reference/+/HEAD/futility/ -[`sign_official_build.sh`]: https://chromium.googlesource.com/chromiumos/platform/vboot_reference/+/HEAD/scripts/image_signing/sign_official_build.sh -[vboot_key_id]: https://chromium.googlesource.com/chromiumos/platform/vboot_reference/+/e7db36856ce418552637d1981c173d22dfe5bf39/firmware/2lib/include/2id.h#5 -[vb2_public_key]: https://chromium.googlesource.com/chromiumos/platform/vboot_reference/+/e7db36856ce418552637d1981c173d22dfe5bf39/firmware/2lib/include/2rsa.h#14 -[chatty-firmware-q]: https://groups.google.com/a/google.com/d/msg/chromeos-chatty-firmware/ZSg423wsFPg/26UbdGwjFQAJ -[`fp_updater.sh`]: http://go/cros-fp-updater-nocturne-source -[`bio_fw_updater`]: https://chromium.googlesource.com/chromiumos/platform2/+/HEAD/biod/tools -[`flashrom`]: https://chromium.googlesource.com/chromiumos/third_party/flashrom/ -[STM32F412]: https://www.st.com/resource/en/reference_manual/dm00180369.pdf -[STM32H743]: https://www.st.com/resource/en/reference_manual/dm00314099.pdf -[`board/nocturne_fp/dev_key.pem`]: https://chromium.googlesource.com/chromiumos/platform/ec/+/HEAD/board/nocturne_fp/dev_key.pem -[`timberslide`]: https://chromium.googlesource.com/chromiumos/platform2/+/HEAD/timberslide -[cros_ec_debugfs]: https://chromium.googlesource.com/chromiumos/third_party/kernel/+/9db44685934a2e4bc9180ea2de87a6c429672395/drivers/platform/chrome/cros_ec_debugfs.c -[Fingerprint Factory Requirements]: ./fingerprint-factory-requirements.md -[Chromium OS test image]: https://chromium.googlesource.com/chromiumos/platform/factory/+/HEAD/README.md#building-test-image -[Chrome OS Config]: https://chromium.googlesource.com/chromiumos/platform2/+/HEAD/chromeos-config/README.md -[Chrome OS Config fingerprint]: https://chromium.googlesource.com/chromiumos/platform2/+/HEAD/chromeos-config/README.md#fingerprint -[section on testing properties]: https://chromium.googlesource.com/chromiumos/platform2/+/HEAD/chromeos-config/README.md#adding-and-testing-new-properties -[Chrome OS board]: https://chromium.googlesource.com/chromiumos/docs/+/HEAD/developer_guide.md#Select-a-board -[biod chromium-os]: https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/4ea72b588af3394cb9fd1c330dcf726472183dfd/virtual/target-chromium-os/target-chromium-os-1.ebuild#154 -[hatch make.defaults]: https://chromium.googlesource.com/chromiumos/overlays/board-overlays/+/2f075f0e7ce09d3eb460f3c529da463a6201276c/overlay-hatch/profiles/base/make.defaults#22 -[Hatch baseboard `make.defaults`]: https://chrome-internal.googlesource.com/chromeos/overlays/baseboard-hatch-private/+/HEAD/profiles/base/make.defaults#17 -[hatch model.yaml]: https://chrome-internal.googlesource.com/chromeos/overlays/overlay-hatch-private/+/HEAD/chromeos-base/chromeos-config-bsp-hatch-private/files/model.yaml -[`ec_extras` attribute]: https://chromium.googlesource.com/chromiumos/platform2/+/HEAD/chromeos-config/README.md#build_targets -[FPMCU_FIRMWARE make.defaults]: https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/4ea72b588af3394cb9fd1c330dcf726472183dfd/profiles/base/make.defaults#157 -[`USE` flag]: https://devmanual.gentoo.org/general-concepts/use-flags/index.html -[`USE` flags]: https://devmanual.gentoo.org/general-concepts/use-flags/index.html -[biod release firmware]: https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/4ea72b588af3394cb9fd1c330dcf726472183dfd/chromeos-base/biod/biod-9999.ebuild#49 -[`chromeos-firmware-fpmcu` ebuild]: https://chrome-internal.googlesource.com/chromeos/overlays/chromeos-overlay/+/HEAD/chromeos-base/chromeos-firmware-fpmcu/chromeos-firmware-fpmcu-9999.ebuild -[firmware ebuild]: https://chrome-internal.googlesource.com/chromeos/overlays/chromeos-overlay/+/HEAD/chromeos-base/chromeos-firmware-fpmcu/chromeos-firmware-fpmcu-9999.ebuild#40 -[`chromeos-fpmcu-release*` ebuilds]: https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/HEAD/sys-firmware -[internal manifest]: https://chromium.googlesource.com/chromiumos/docs/+/HEAD/developer_guide.md#get-the-source-code -[Unit Tests]: ../unit_tests.md -[run the unit tests]: ../unit_tests.md#running -[Measuring Power]: ./fingerprint-dev-for-partners.md#measure-power -[dragonclaw]: ./fingerprint-dev-for-partners.md#fpmcu-dev-board -[FPC 1145]: ../../driver/fingerprint/fpc/libfp/fpc1145_private.h -[FPC 1025]: ../../driver/fingerprint/fpc/bep/fpc1025_private.h -[FPC 1145 Template Size]: https://chromium.googlesource.com/chromiumos/platform/ec/+/127521b109be8aac352e80e319e46ed123360408/driver/fingerprint/fpc/libfp/fpc1145_private.h#46 -[FPC 1025 Template Size]: https://chromium.googlesource.com/chromiumos/platform/ec/+/127521b109be8aac352e80e319e46ed123360408/driver/fingerprint/fpc/bep/fpc1025_private.h#44 -[Dragonclaw v0.2]: ./fingerprint-dev-for-partners.md#fpmcu-dev-board -[Icetower v0.2]: ./fingerprint-dev-for-partners.md#fpmcu-dev-board -[Nucleo F412ZG]: https://www.digikey.com/en/products/detail/stmicroelectronics/NUCLEO-F412ZG/6137573 -[Nucleo H743ZI2]: https://www.digikey.com/en/products/detail/stmicroelectronics/NUCLEO-H743ZI2/10130892 -[CBI Info]: https://chromium.googlesource.com/chromiumos/docs/+/HEAD/design_docs/cros_board_info.md -[Chrome OS Config SKU]: https://chromium.googlesource.com/chromiumos/platform2/+/HEAD/chromeos-config/README.md#identity -[Chrome OS Project Configuration]: https://chromium.googlesource.com/chromiumos/config/+/HEAD/README.md -[Starlark]: https://docs.bazel.build/versions/master/skylark/language.html -[`create_fingerprint`]: https://chromium.googlesource.com/chromiumos/config/+/e1fa0d7f56eb3dd6e9378e4326de086ada46b7d3/util/hw_topology.star#444 -[Morphius `config.star`]: https://chrome-internal.googlesource.com/chromeos/project/zork/morphius/+/593b657a776ed6b320c826916adc9cd845faf709/config.star#85 -[regenerate the config]: https://chromium.googlesource.com/chromiumos/config/+/HEAD/README.md#making-configuration-changes-for-your-project -[`CLFactory`]: https://chromium.googlesource.com/chromiumos/config/+/HEAD/README.md#making-bulk-changes-across-repos |