intel platforms: add list of Chromebook dev. environments by marc-hb · Pull Request #379 · thesofproject/sof-docs

marc-hb · 2021-11-03T01:56:21Z

Add list of options to develop on Chromebooks and links - especially
Zephyr's detailed Crouton guide.

Signed-off-by: Marc Herbert marc.herbert@intel.com

cujomalainey · 2021-11-03T21:37:41Z

+4. Chromebooks and SOF
+----------------------
+
+As stated above, Chromebook firmware is as of 2021 configured with the


this is more circa 2019/2020

I meant "up to today 2021". As a native speaker could you help me rephrase?

Ah if you meaning as "at the time of writing this" then I think this is good. We have 0 intent to change this, so I think its safe to write it as a "beginning in" style fashion to convey when the switch happened

cujomalainey · 2021-11-03T21:38:50Z

+As stated above, Chromebook firmware is as of 2021 configured with the
+*community* key which means Chromebooks can run audio firmware signed by
+anyone. The entire filesystem is locked by default instead but there are
+a couple options to disable security for development purposes.


recommend linking to dev mode process? https://chromium.googlesource.com/chromiumos/docs/+/master/developer_mode.md

You're right, I didn't because I assume the developer guide below already would but the Developer Mode is of more general interest, not just for ChromeOS

The link below is a few generations behind, this should always be up to date :)

cujomalainey · 2021-11-03T21:39:38Z

+- ChromeOS has direct hardware access but development cannot happen on
+  ChromeOS itself, it requires a separate workstation similar to how
+  most embedded development does. Setting up its ``cros_sdk`` requires
+  significant time and effort, see the `ChromeOS developer guide


time yes, but it is "supposed" to be low effort... that being said, you do not need the cros_sdk to do strictly FW dev, if you want to modify the kernel then yes

Good point about the kernel, thanks. I tried to avoid making a difference between SOF fw and the kernel (similar problem with Crouton) to keep this section short but now I think it's too much of a shortcut.

cujomalainey · 2021-11-03T21:41:02Z

+  <https://docs.zephyrproject.org/2.7.0/boards/xtensa/intel_adsp_cavs25/doc/index.html>`_
+  on how to use Crouton for SOF. 
+
+- Finally, it is possible to "dual-boot" a regular Linux distribution on


or just wipe it entirely?

Good point, will add.

"Dual-boot" is possible on some chromebooks? I rather more interested in this part. :) I'd like to know which ones support dual-boots.
And why it is least secure option?

Yes, it is, I have coworkers how have done it. I believe you have to use grub or something of the sorts to pick your boot partition. I believe its least secure because it completely disables all boot verification, this might be different though with our latest version of depthcharge, Havent seen it done in a few years.

"Dual-boot" is possible on some chromebooks?

chrx.org does that.

marc-hb

Thanks @cujomalainey for the thorough review!

marc-hb · 2021-11-03T21:58:23Z

+  <https://docs.zephyrproject.org/2.7.0/boards/xtensa/intel_adsp_cavs25/doc/index.html>`_
+  on how to use Crouton for SOF. 
+
+- Finally, it is possible to "dual-boot" a regular Linux distribution on


Good point, will add.

marc-hb · 2021-11-03T22:07:25Z

+- ChromeOS has direct hardware access but development cannot happen on
+  ChromeOS itself, it requires a separate workstation similar to how
+  most embedded development does. Setting up its ``cros_sdk`` requires
+  significant time and effort, see the `ChromeOS developer guide


Good point about the kernel, thanks. I tried to avoid making a difference between SOF fw and the kernel (similar problem with Crouton) to keep this section short but now I think it's too much of a shortcut.

marc-hb · 2021-11-03T22:08:35Z

+4. Chromebooks and SOF
+----------------------
+
+As stated above, Chromebook firmware is as of 2021 configured with the


I meant "up to today 2021". As a native speaker could you help me rephrase?

marc-hb · 2021-11-03T22:10:08Z

+As stated above, Chromebook firmware is as of 2021 configured with the
+*community* key which means Chromebooks can run audio firmware signed by
+anyone. The entire filesystem is locked by default instead but there are
+a couple options to disable security for development purposes.


You're right, I didn't because I assume the developer guide below already would but the Developer Mode is of more general interest, not just for ChromeOS

fredoh9

Overall looks good. Great to see the link to Zephyr document

fredoh9 · 2021-11-04T19:21:15Z

+  <https://docs.zephyrproject.org/2.7.0/boards/xtensa/intel_adsp_cavs25/doc/index.html>`_
+  on how to use Crouton for SOF. 
+
+- Finally, it is possible to "dual-boot" a regular Linux distribution on


"Dual-boot" is possible on some chromebooks? I rather more interested in this part. :) I'd like to know which ones support dual-boots.
And why it is least secure option?

cujomalainey

couple nits but otherwise good

cujomalainey · 2021-11-12T19:39:40Z

+  ChromeOS by a regular Linux distribution on *some* Chromebooks and
+  forget it is a Chromebook entirely. This comes at a price however: it
+  is the least secure option and the more likely to make your device
+  permanently unusable ("brick"). That level of risk is highly dependent


Minus using a debuging tool

Good point but I'm trying to keep this (most dangerous) section short and "simply scary" and debug tools would IMHO stray a bit too far from SOF. I believe there are enough references in case anyone wants to go and dive into serious Chromebook hacking.

I'm guessing you're thinking about https://chromium.googlesource.com/chromiumos/platform/ec/+/cr50_stab/docs/case_closed_debugging.md and similar? From past experience these solutions also tend to be somewhat model-dependent.

From what I understand CCD should be supported going forward, its not the fastest thing in the world but if you want to unlock your system its better than opening some of these super thin cases.

but yes i agree, good to make is scary :)

Add list of options to develop on Chromebooks and links - especially Zephyr's detailed Crouton guide. Signed-off-by: Marc Herbert <marc.herbert@intel.com>

marc-hb · 2021-11-11T23:33:12Z

+  <https://docs.zephyrproject.org/2.7.0/boards/xtensa/intel_adsp_cavs25/doc/index.html>`_
+  on how to use Crouton for SOF. 
+
+- Finally, it is possible to "dual-boot" a regular Linux distribution on


"Dual-boot" is possible on some chromebooks?

chrx.org does that.

marc-hb · 2021-11-12T20:11:59Z

+  ChromeOS by a regular Linux distribution on *some* Chromebooks and
+  forget it is a Chromebook entirely. This comes at a price however: it
+  is the least secure option and the more likely to make your device
+  permanently unusable ("brick"). That level of risk is highly dependent


Good point but I'm trying to keep this (most dangerous) section short and "simply scary" and debug tools would IMHO stray a bit too far from SOF. I believe there are enough references in case anyone wants to go and dive into serious Chromebook hacking.

I'm guessing you're thinking about https://chromium.googlesource.com/chromiumos/platform/ec/+/cr50_stab/docs/case_closed_debugging.md and similar? From past experience these solutions also tend to be somewhat model-dependent.

lgirdwood · 2021-11-15T17:14:39Z

@anton-intel @deb-intel shall we merge and fix grammar incrementally ?

anton-intel · 2021-11-15T17:28:07Z

@anton-intel @deb-intel shall we merge and fix grammar incrementally ?

@lgirdwood Yes, please. I'll make some edits in a new pull request.

marc-hb marked this pull request as ready for review November 3, 2021 01:58

marc-hb requested review from anton-intel, deb-intel, intelkevinputnam and lgirdwood as code owners November 3, 2021 01:58

marc-hb requested review from aiChaoSONG, andyross, cujomalainey, dcpleung, fredoh9, kv2019i, lyakh, plbossart and sathya-nujella November 3, 2021 02:00

marc-hb mentioned this pull request Nov 3, 2021

[RFC] enable sof-test on ChromeOS thesofproject/sof-test#576

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dcpleung approved these changes Nov 3, 2021

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cujomalainey reviewed Nov 3, 2021

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marc-hb commented Nov 3, 2021

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marc-hb marked this pull request as draft November 3, 2021 22:10

fredoh9 approved these changes Nov 4, 2021

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marc-hb force-pushed the chromebook-options branch 2 times, most recently from 1c8e8b8 to 5996428 Compare November 12, 2021 00:05

marc-hb marked this pull request as ready for review November 12, 2021 00:20

cujomalainey approved these changes Nov 12, 2021

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intel platforms: add list of Chromebook dev. environments

08fb806

Add list of options to develop on Chromebooks and links - especially Zephyr's detailed Crouton guide. Signed-off-by: Marc Herbert <marc.herbert@intel.com>

marc-hb force-pushed the chromebook-options branch from 5996428 to 08fb806 Compare November 12, 2021 20:05

marc-hb commented Nov 12, 2021

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cujomalainey approved these changes Nov 12, 2021

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lgirdwood merged commit 07525f8 into thesofproject:master Nov 15, 2021

marc-hb deleted the chromebook-options branch November 16, 2021 06:36

marc-hb mentioned this pull request Jan 3, 2022

Update list of development HW to include new boards from Intel, AMD, NXP, Mediatek and Google #398

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marc-hb mentioned this pull request Feb 14, 2022

FW authentication questions regarding Apollo Lake chromebooks thesofproject/sof#5361

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