boot-architecture

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Recommendation for identifying partition with firmware to be loaded from SD-card

by Heinrich Schuchardt

Linux distributions are interested in providing a single image which enables a high number of boards to boot. This is simple if the boot firmware (EDK II or U-Boot) is installed on flash. For boards that expect to load a boot loader like U-Boot from an SD-card it is necessary that the firmware locations for different boards on the SD-card don't collide. When loading from SD-card or eMMC the sector at which the binary starts has to be identified. The following has been implemented: - start from hard coded sector number - load file from FAT file system - load from given partition number - load from partition with boot flag set (MBR partioning only) - load from partition with specific type GUID Loading by partition type GUID seems the most appropriate to avoid collisions between the firmware for different boards. Often firmware is separated into multiple parts due to firmware restrictions, e.g. U-Boot SPL and main U-Boot (e.g. as .itb file). Here the same considerations apply. Using a partition type GUID to identify further firmware parts to be loaded is best suited to avoid collisions. I would suggest to add a recommendation to the EBBR specification to use SoC specific partition type GUIDs to identify firmware to be loaded from SD-card. Please, provide your feedback. Best regards Heinrich

3 years

Re: [RISC-V][tech-os-a-see] Recommendation for identifying partition with firmware to be loaded from SD-card

by Heinrich Schuchardt

On 5/1/23 16:31, Aaron Durbin wrote: > Hi, > > On Mon, May 1, 2023 at 8:26 AM Heinrich Schuchardt > <heinrich.schuchardt(a)canonical.com > <mailto:heinrich.schuchardt@canonical.com>> wrote: > > Linux distributions are interested in providing a single image which > enables a high number of boards to boot. This is simple if the boot > firmware (EDK II or U-Boot) is installed on flash. > > For boards that expect to load a boot loader like U-Boot from an SD-card > it is necessary that the firmware locations for different boards > on the SD-card don't collide. > > When loading from SD-card or eMMC the sector at which the binary > starts has to be identified. The following has been implemented: > > - start from hard coded sector number > - load file from FAT file system > - load from given partition number > - load from partition with boot flag set (MBR partioning only) > - load from partition with specific type GUID > > Loading by partition type GUID seems the most appropriate to avoid > collisions between the firmware for different boards. > > Often firmware is separated into multiple parts due to firmware > restrictions, e.g. U-Boot SPL and main U-Boot (e.g. as .itb file). > > Here the same considerations apply. Using a partition type GUID to > identify further firmware parts to be loaded is best suited to > avoid collisions. > > I would suggest to add a recommendation to the EBBR specification > to use SoC specific partition type GUIDs to identify firmware to > be loaded from SD-card. > > > Who is loading the firmware that is identified by a GUID? And how does > that tie into Linux distros? I don't see anything wrong w/ the > recommendation, but I didn't completely follow which piece of software > is loading firmware and how the GUID reduces the problems. Also, is this > "SoC specific partition type GUID" unique per SoC? Or is it expected to > be a global GUID? Booting firmware starts at boot ROM which may either directly load a piece of software from SD-card or may load a piece of software from flash which in turn will load the next step boot loader from the SD-card. From the view of a distro it is best if each board uses a separate GUID. This allows to add multiple U-Boot versions (or other boot software) on the same SD-card. Best regards Heinrich

3 years

EBBR call today Apr 24

by Vincent Stehlé

Hi, We will have an EBBR call[1] today, Apr 24, at 15h UTC/BST. On the agenda[2] we have one pull request review continuation: - Pull request #[105]: Recommend the firmware update protocol We could also go through the opened issues[3] if willing. Feel free to add to the agenda, directly on the wiki page or by e-mail. We can use this pad[4] 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://github.com/ARM-software/ebbr/issues [4]: https://mensuel.framapad.org/p/ebbr-call-of-apr-24-a0kw?lang=en [105]: https://github.com/ARM-software/ebbr/pull/105

3 years, 1 month

No EBBR call next Monday, Apr 10

by Vincent Stehlé

Hi, Next Monday, Apr 10, is Easter Monday and is a bank holiday in some countries. Let us therefore cancel the corresponding EBBR call, please. The next EBBR call will be held on Apr 24. Feel free to add to the agenda, directly on the wiki page[1] or by e-mail. Best regards, Vincent Stehlé System Architect - Arm [1]: https://github.com/ARM-software/ebbr/wiki/EBBR-Meetings

3 years, 1 month

EBBR call today Mar 27

by Vincent Stehlé

Hi, We will have an EBBR call[1] today, Mar 27, at 15h UTC/BST. On the agenda[2] we have pull requests[3] reviews continuations: - Pull request #102: File Format For Storing EFI Variables (Heinrich) - Pull request #104: Make monotonic counter optional (was: Relax monotonic counter nonvolatility) - Pull request #105: Recommend the firmware update protocol Feel free to add to the agenda, directly on the wiki page or by e-mail. We can use this pad[4] 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://github.com/ARM-software/ebbr/pulls [4]: https://mensuel.framapad.org/p/ebbr-call-of-mar-27-a027

3 years, 2 months

EBBR call today Mar 13

by Vincent Stehlé

Hi, We will have an EBBR call[1] today at 15h UTC/BST. On the agenda for today[2] we have pull requests[3] reviews: - Pull request #102: File Format For Storing EFI Variables (Heinrich) - Pull request #104: Relax monotonic counter nonvolatility - Pull request #105: Recommend the firmware update protocol Feel free to add to the agenda, directly on the wiki page or by e-mail. We can use this pad[4] 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://github.com/ARM-software/ebbr/pulls [4]: https://mensuel.framapad.org/p/ebbr-call-of-mar-13-9zsw

3 years, 2 months

No DT call today or going forward

by Bill Mills

All, There will be no DT call today. In fact, I am going to cancel the series. Since Feb 1, Mondays don't work for me anymore. I have discussed this inside of Linaro and we don't feel a periodic DT call is needed at this time. I am keeping a copy of the invite list in case we want to schedule special meetings on specific topics. If you feel we need this call and wish to host it, please contact me on this list or directly. Thanks, Bill -- Bill Mills Principal Technical Consultant, Linaro +1-240-643-0836 TZ: US Eastern Work Schedule: Tues/Wed/Thur

3 years, 2 months

EBBR call today Feb 27

by Vincent Stehlé

Hi, We will have an EBBR call[1] today at 15h UTC/BST. On the agenda[2]: - Review the pull requests[3]: + Pull request #102: File Format For Storing EFI Variables (Heinrich) + Pull request #103: Require capsule update "on disk" and corresponding variables Feel free to add to the agenda, directly on the wiki page or by e-mail. We can use this pad[4] 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://github.com/ARM-software/ebbr/pulls [4]: https://mensuel.framapad.org/p/ebbr-call-of-feb-27-9zjk

3 years, 2 months

No DT call on Feb 20

by Bill Mills

All, Monday Feb 20 is a US holiday. We won't have a meeting. Thanks, Bill -- Bill Mills Principal Technical Consultant, Linaro +1-240-643-0836 TZ: US Eastern Work Schedule: Tues/Wed/Thur

3 years, 3 months

EBBR call today Feb 13

by Vincent Stehlé

Hi, We will have an EBBR call[1] today at 15h UTC/BST. On the agenda[2] today: - SetVariable() at runtime for boards that store EFI variables on an RPMB 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-feb-13-9za9?lang=en

3 years, 3 months

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