boot-architecture

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Second poll to find an even better schedule for the EBBR call

by Vincent Stehlé

Dear EBBR stakeholders, Thank you for having completed the poll, to try to find an even better schedule for our EBBR call. It appears that people have available slots on the afternoon of Monday, Wednesday and Friday. Here is a second (and hopefully last) poll, with 1/2 hour granularity: https://framadate.org/Wwf2GCiOsQywWfTg Could you please add your availabilities in there? Thank you! Best regards, Vincent Stehlé System Architect - Arm

1 year, 8 months

No EBBR call today, Sep 23?

by Vincent Stehlé

Hi, We have nothing on today's EBBR call's agenda [1]; we might as well cancel it. If you have an urgent topic to discuss today, please let us know before 1pm BST (12pm UTC), otherwise we will adjourn the call. Best regards, Vincent Stehlé System Architect - Arm [1]: https://github.com/ARM-software/ebbr/wiki/EBBR-Meetings

1 year, 8 months

EBBR call today Sep 9

by Vincent Stehlé

Hi, We will have an EBBR call[1] today, Sep 9 at 15h30 BST (14h30 UTC; BST is active). We have only one pull requests on the agenda[2], therefore it might be a short call: - #132: Boot Manager requirements Feel free to add to the agenda, directly on the wiki page or by e-mail. We can use this pad[3] for the meeting notes. Best regards, Vincent Stehlé System Architect - Arm [1] https://armltd.zoom.us/j/92081365511?pwd=SFZpRitXUEp3Zy9GM0h3UUZ1b1pnUT09 [2] https://github.com/ARM-software/ebbr/wiki/EBBR-Meetings [3] https://mensuel.framapad.org/p/ebbr-call-of-sep-9-a9wv?lang=en [132] https://github.com/ARM-software/ebbr/pull/132

1 year, 8 months

EBBR next call and poll

by Vincent Stehlé

Dear EBBR stakeholders, I hope you all had a nice summer break. Our next EBBR call is approaching as it will take place next Monday, Aug 26 at 14h30 BST (13h30 UTC; BST is active). In the mean time, I would like to remind you that we have a poll[1] on-going, to try to find an even better schedule for our EBBR call. Thank you to those who added their availabilities already; for those of you, who have not yet completed this first poll, could you please do so? At the time of writing, we have a couple of pull requests on the agenda[2]: - #131: Update UEFI version to 2.10 A - #132: Boot Manager requirements This an attempt at fixing issue #130: Explicitly require boot manager, from Heinrich Please have a look, and feel free to add to the agenda, directly on the wiki page or by e-mail. Best regards, Vincent Stehlé System Architect - Arm [1] https://framadate.org/6jm8P3jHqAzmv8Xo [2] https://github.com/ARM-software/ebbr/wiki/EBBR-Meetings [130] https://github.com/ARM-software/ebbr/issues/130 [131] https://github.com/ARM-software/ebbr/pull/131 [132] https://github.com/ARM-software/ebbr/pull/132

1 year, 9 months

Re: Re: Re: Firmware Partition Filesystem query

by Ghennadi Procopciuc

>> Could this section be updated in order to reduce the number of different >> interpretations? > > Yes, it can be clarified. As Daniel says, this section is only > intended for platforms where there is no other place to store > firmware. If the OS and the firmware need to share a logical block > device, and there is no way to protect the firmware bits, then this > section describes how they can co-exist. e.g., you don't want an OS > deployment to accidentally wipe out firmware. > > It is preferred and encouraged to have firmware contained entirely in > something separate from the main block storage. For example, in eMMC > boot areas (separate from the primary area), or on a separate device > entirely (SPI flash). I predict that a future version of EBBR will > require this and drop the shared storage option entirely because it is > necessary to protect against attacks against firmware (replacement or > deletion) > > g. > Thank you all contributing to this thread! While most of the points in this thread are self-explanatory and should not need a summary, I want to extract the main points to avoid misinterpretations: 1. Chapters '4.1 Partitioning of Shared Storage' and '4.2 Firmware Partition Filesystem' refer to cases when shared storage is used for OS and firmware images. In this case, the block device needs to be partitioned using GPT and the firmware binaries should be stored in a FAT partition. The folder organization for this partition is described in the '4.2.1 The firmware directory hierarchy' chapter. Ideally, the BootROM should be able to load images from a FAT partition. However, a feature release of the EBBR is likely to drop this option in the future. 2. For scenarios involving dedicated storage, the organization of the underlying storage for firmware falls outside the scope of the EBBR and can be arranged according to the SoC vendor's discretion. This can include options such as offset addressing, without GPT, with MRB, with or without a partition, based on the platform's requirements or limitations. Could you please confirm that this understanding is correct? > If I recall correctly, on the Arm platform, A-BL1 (BootROM) and A-BL2 > are responsible only for > loading the images. SCP_BL2 is loaded by BL2 into trusted SRAM and then > transferred to the SCP using the MHU protocol and I believe it is > followed this > way for other platforms also (?). > In summary, A-BL1(BootROM) and A-BL2 need to be aware of their next > stages to load those > images properly: > BootROM -> BL2 -> BL31 -> ... > | > v > SCP If the above summary points are valid, then in the case of a shared device, the BL2 should be able to load the next image(s) (either FIP or BL31) from a FAT partition, I suppose. Regards, Ghennadi

1 year, 10 months

Firmware Partition Filesystem query

by Ghennadi Procopciuc

Greetings everyone, I came across the following paragraph while reading the 'Firmware Partition Filesystem' chapter from EBBR v2.2.0 and I would like to clarify my understanding: Where possible, firmware images and data should be stored in a filesystem. Firmware can be stored either in a dedicated firmware partition, or in certain circumstances in the UEFI System Partition (ESP). Using a filesystem makes it simpler to manage multiple firmware files and makes it possible for a single disk image to contain firmware for multiple platforms. Dedicated firmware partitions should be formatted with a FAT filesystem as defined in UEFI § 13.3 File System Format. Dedicated firmware partitions should use the same /FIRMWARE directory hierarchy. OS tools shall ignore dedicated firmware partitions, and shall not attempt to use a dedicated firmware partition as an ESP Questions: 1. Does the above paragraph mean that, if the device allows, all firmware binaries (TF-A, U-Boot, and some others) must be stored in a dedicated firmware partition formatted with a FAT filesystem and GUID Partition Table (GPT) disk layout? 2. If so, would this also mean that, where possible, the BootROM or a (first stage) bootloader running before TF-A should have GPT and FAT support embedded support to load one of the TF-A stages (BL1/BL2)? Regards, Ghennadi

1 year, 10 months

No EBBR call today?

by Vincent Stehlé

Hi, We have nothing on today's EBBR call's agenda [1]; I would thus be inclined to cancel it. If you have an urgent topic to discuss today, please let us know before 1pm UTC, otherwise we will adjourn the call. Best regards, Vincent Stehlé System Architect - Arm [1]: https://github.com/ARM-software/ebbr/wiki/EBBR-Meetings

1 year, 10 months

Moving the EBBR call 1/2h earlier?

by Vincent Stehlé

Hi, The question of moving the EBBR call 1/2 hour earlier was raised during our last call [1]. Some people have colliding meetings now and it would make their lives easier. Also, this seemed practical for all the people present. Could all the EBBR attendees please tick their available hours on the following poll? https://framadate.org/FWI2Ff4Tmyz9yOfR Thank you in advance! If possible we will move the EBBR call to 14:30 UTC/BST starting with our next call on Jul 15. Best regards, Vincent Stehlé System Architect - Arm [1] https://github.com/ARM-software/ebbr/wiki/EBBR-Notes-2024.07.01

1 year, 10 months

EBBR call today Jul 1

by Vincent Stehlé

Hi, We will have an EBBR call[1] today, Jul 1 at 15h BST (14h UTC; BST is active). We have two pull requests on the agenda[2]: - #[119]: Require authenticated FMP firmware updates - #[129]: Deprecate spin tables Feel free to add to the agenda, directly on the wiki page or by e-mail. We can use this pad[3] for the meeting notes. Best regards, Vincent Stehlé System Architect - Arm [1] https://armltd.zoom.us/j/92081365511?pwd=SFZpRitXUEp3Zy9GM0h3UUZ1b1pnUT09 [2] https://github.com/ARM-software/ebbr/wiki/EBBR-Meetings [3] https://mensuel.framapad.org/p/ebbr-call-of-jul-1-a8m7?lang=en [119] https://github.com/ARM-software/ebbr/pull/119 [129] https://github.com/ARM-software/ebbr/pull/129

1 year, 10 months

[PATCH RFC v3 0/9] dt-bindings: hwinfo: Introduce board-id

by Elliot Berman

Device manufacturers frequently ship multiple boards or SKUs under a single software package. These software packages will ship multiple devicetree blobs and require some mechanism to pick the correct DTB for the board the software package was deployed. Introduce a common definition for adding board identifiers to device trees. board-id provides a mechanism for bootloaders to select the appropriate DTB which is vendor/OEM-agnostic. This series is based off a talk I gave at EOSS NA 2024 [1]. There is some further discussion about how to do devicetree selection in the boot-architecture mailing list [2]. [1]: https://sched.co/1aBFy [2]: https://lists.linaro.org/archives/list/boot-architecture@lists.linaro.org/t… Quick summary ------------- This series introduces a new subnode in the root: / { board-id { some-hw-id = <value>; other-hw-id = <val1>, <val2>; }; }; Firmware provides a mechanism to fetch the values of "some-hw-id" and "other-hw-id" based on the property name. I'd like to leave exact mechanism data out of the scope of this proposal to keep this proposal flexible because it seems architecture specific, although I think we we should discuss possible approaches. A DTB matches if firmware can provide a matching value for every one of the properties under /board-id. In the above example, val1 and val2 are both valid values and firmware only provides the one that actually describes the board. It's expected that devicetree's board-id don't describe all the properties firmware could provide. For instance, a devicetree overlay may only care about "other-hw-id" and not "some-hw-id". Thus, it need only mention "other-hw-id" in its board-id node. Isn't that what the compatible property is for? ----------------------------------------------- The compatible property can be used for board matching, but requires bootloaders and/or firmware to maintain a database of possible strings to match against or implement complex compatible string matching. Compatible string matching becomes complicated when there are multiple versions of board: the device tree selector should recognize a DTB that cares to distinguish between v1/v2 and a DTB that doesn't make the distinction. An eeprom either needs to store the compatible strings that could match against the board or the bootloader needs to have vendor-specific decoding logic for the compatible string. Neither increasing eeprom storage nor adding vendor-specific decoding logic is desirable. How is this better than Qualcomm's qcom,msm-id/qcom,board-id? ------------------------------------------------------------- The selection process for devicetrees was Qualcomm-specific and not useful for other devices and bootloaders that were not developed by Qualcomm because a complex algorithm was used to implement. Board-ids provide a matching solution that can be implemented by bootloaders without introducing vendor-specific code. Qualcomm uses three devicetree properties: msm-id (interchangeably: soc-id), board-id, and pmic-id. This does not scale well for use casese which use identifiers, for example, to distinguish between a display panel. For a display panel, an approach could be to add a new property: display-id, but now bootloaders need to be updated to also read this property. We want to avoid requiring to update bootloaders with new hardware identifiers: a bootloader need only recognize the identifiers it can handle. Notes about the patches ----------------------- In my opinion, most of the patches in this series should be submitted to libfdt and/or dtschema project. I've made them apply on the kernel tree to be easier for other folks to pick them up and play with them. As the patches evolve, I can send them to the appropriate projects. Signed-off-by: Elliot Berman <quic_eberman(a)quicinc.com> --- Changes in v3: - Follow new "/board-id {}" approach, which uses key-value pairs - Add match algorithm in libfdt and some examples to demo how the selection could work in tools/board-id Changes in V2: - Addressed few comments related to board-id, and DDR type. - Link to V2: https://lore.kernel.org/all/a930a3d6-0846-a709-8fe9-44335fec92ca@quicinc.co… --- Amrit Anand (1): dt-bindings: arm: qcom: Update Devicetree identifiers Elliot Berman (8): libfdt: board-id: Implement board-id scoring dt-bindings: board: Introduce board-id fdt-select-board: Add test tool for selecting dtbs based on board-id dt-bindings: board: Document board-ids for Qualcomm devices arm64: boot: dts: sm8650: Add board-id arm64: boot: dts: qcom: Use phandles for thermal_zones arm64: boot: dts: qcom: sm8550: Split into overlays tools: board-id: Add test suite .../devicetree/bindings/board/board-id.yaml | 24 ++++ .../devicetree/bindings/board/qcom,board-id.yaml | 144 ++++++++++++++++++++ arch/arm64/boot/dts/qcom/Makefile | 4 + arch/arm64/boot/dts/qcom/pm8010.dtsi | 62 ++++----- arch/arm64/boot/dts/qcom/pm8550.dtsi | 32 ++--- arch/arm64/boot/dts/qcom/pm8550b.dtsi | 36 +++-- arch/arm64/boot/dts/qcom/pm8550ve.dtsi | 38 +++--- arch/arm64/boot/dts/qcom/pm8550vs.dtsi | 128 +++++++++-------- arch/arm64/boot/dts/qcom/pmr735d_a.dtsi | 38 +++--- arch/arm64/boot/dts/qcom/pmr735d_b.dtsi | 38 +++--- .../dts/qcom/{sm8550-mtp.dts => sm8550-mtp.dtso} | 24 +++- .../dts/qcom/{sm8550-qrd.dts => sm8550-qrd.dtso} | 22 ++- .../boot/dts/qcom/{sm8550.dtsi => sm8550.dts} | 10 +- arch/arm64/boot/dts/qcom/sm8650-mtp.dts | 6 + arch/arm64/boot/dts/qcom/sm8650-qrd.dts | 6 + arch/arm64/boot/dts/qcom/sm8650.dtsi | 2 +- include/dt-bindings/arm/qcom,ids.h | 86 ++++++++++-- scripts/dtc/.gitignore | 1 + scripts/dtc/Makefile | 3 +- scripts/dtc/fdt-select-board.c | 126 +++++++++++++++++ scripts/dtc/libfdt/fdt_ro.c | 76 +++++++++++ scripts/dtc/libfdt/libfdt.h | 54 ++++++++ tools/board-id/test.py | 151 +++++++++++++++++++++ 23 files changed, 901 insertions(+), 210 deletions(-) --- base-commit: e8f897f4afef0031fe618a8e94127a0934896aba change-id: 20240112-board-ids-809ff0281ee5 Best regards, -- Elliot Berman <quic_eberman(a)quicinc.com>

1 year, 11 months

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