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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 14 Sep 2018
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      They store the blob on write-protected SPI flash (because users must not have the freedom to modify any firmware they do wind up running), and write some code for the secondary CPU just so that the main CPU doesn't get digital cooties from (eeeeeew) touching the DDR4 code.

      1 reply 0 retweets 19 likes
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    2. Hector Martin‏ @marcan42 14 Sep 2018
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      Keep in mind this isn't even about the secondary (or main) CPU *running* the firmware. The firmware is always run by an embedded processor in the DDR4 PHY anyway. This is just about having the main CPU never even *see* the firmware. See no evil, hear no evil, speak no evil.

      1 reply 0 retweets 17 likes
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    3. Hector Martin‏ @marcan42 14 Sep 2018
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      So it doesn't matter that the DDR4 controller firmware has access to all RAM and obviously can pwn the main CPU at will. As long as you bury it in read-only memory, and make sure it never is accessed by the main CPU, the FSF will give your product their meaningless rubber stamp.

      1 reply 1 retweet 19 likes
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    4. Hector Martin‏ @marcan42 14 Sep 2018
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      What if the firmware is backdoored? Who knows! You're not supposed to touch it from the main CPU, lest you get digital cooties (eeeeeeeew). Just don't think about it. Move on. Everything's Libre™ (except the parts you can't see). It'll be fine.

      1 reply 0 retweets 13 likes
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    5. Hector Martin‏ @marcan42 14 Sep 2018
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      So yeah, screw you, FSF. I want that blob compiled into the main CPU's u-boot, from a freely downloadable blobs repo, where I can do whatever I damn well want with it. Which is the sane engineering approach, and the most user-freedom-respecting thing to do.

      1 reply 1 retweet 35 likes
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    6. Hector Martin‏ @marcan42 14 Sep 2018
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      Link to the story from @Puri_sm. The fact that their engineer had to design that horrible nonsense workaround with a straight face and write the blog post to top it all off makes me sad.https://puri.sm/posts/librem5-solving-the-first-fsf-ryf-hurdle/ …

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    7. olddellian‏ @olddellian 15 Sep 2018
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      Replying to @marcan42 @Puri_sm

      The secondary processor exemption is also used by #libreboot laptops which have proprietary Embedded Controller firmware. The irony there is that they recommend running proprietary Lenovo BIOS to update that Embedded Controller firmware: https://libreboot.org/docs/hardware/#ec-update-on-i945-x60-t60-and-gm45-x200-t400-t500-r400-w500 …

      1 reply 0 retweets 3 likes
    8. Hector Martin‏ @marcan42 15 Sep 2018
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      Replying to @olddellian @Puri_sm

      And microcode inside the CPU, and proprietary firmware inside the Librem 5's baseband module, and... Everything. I bet there are ~zero "RYF" devices not using that exception. It's doing real harm to user freedom. I want my baseband firmware in /lib/firmware, not some spiflash!

      2 replies 0 retweets 3 likes
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    10. olddellian‏ @olddellian 17 Sep 2018
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      Replying to @psyburr @marcan42 @Puri_sm

      Especially with the current environment, yes/no certifications really aren't that helpful; what would be better would be a third party analysis of: Is there proprietary code? Where is it stored and executed? Is it able to be updated? What access to the system does it have?

      2 replies 0 retweets 0 likes
      Hector Martin‏ @marcan42 17 Sep 2018
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      Replying to @olddellian @psyburr @Puri_sm

      And how much code is it? What is the impact? I really couldn't care less about a couple kB of firmware in a dumb USB mouse, but I certainly do care about dozens of megabytes in a cellular baseband.

      4:19 AM - 17 Sep 2018
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