#linux-sunxi on 2023-11-11 — irc logs at oftc.irclog.whitequark.org

2022-12-21 00:44 ChanServ changed the topic of #linux-sunxi to: Allwinner/sunxi development - Did you try looking at our wiki? https://linux-sunxi.org - Don't ask to ask. Just ask and wait for an answer! - This channel is logged at https://oftc.irclog.whitequark.org/linux-sunxi

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00:35 <apritzel> ctag: if the secure boot fuse is burnt, then the BROM expects a TOC0 container on the SD card instead of the normal eGON one

00:36 <apritzel> https://linux-sunxi.org/TOC0#TOC0_images_generation

00:43 <ctag> Thanks apritzel. That's starting to make some sense. I see the hex of fel-sdboot.sunxi begins with the eGON header.

00:43 <ctag> So I'd need to generate a version of that which uses TOC0

00:44 <ctag> Will give that a shot in a week, leaving for a work trip Monday and I left the boards with a friend to tinker with.

00:45 <apritzel> ctag: try: "make fel-sdboot.bin", then use the sequence from the Wiki to generate the TOC0

01:36 <ctag> Thanks apritzel. Using uboot mkimage, it took fel-sdboot.elf and made output.toc0.

01:37 <ctag> I'm still a little confused on the jump to FEL. I see references to 0x20000 as the address, but the user guide pdf says 0x20 and 0x64(sbrom)

01:37 <ctag> Page 129 of this: https://linux-sunxi.org/images/2/24/H616_User_Manual_V1.0_cleaned.pdf

01:55 <apritzel> 0x20000 is the address of SRAM A1, where the TOC0 image needs to be loaded to, first

01:56 <apritzel> then that branches into 0x20, which is the FEL entry point in the BootROM

01:57 <apritzel> smaeul should know if we should branch to 0x64 for secure devices instead

01:58 <apritzel> ctag: if those boards expose some FEL pin or pad, pulling this to GND while booting might be easier

02:01 <ctag> I think it does, but when I tie it to ground nothing changes. The USB fel device appears and goes away immediately

02:01 <ctag> If I time the sunxi-fel ver command right, it just complains that the device failed the "AWUS" check

02:02 <ctag> I was thinking maybe I should add a button, so I can click it to ground and let go? The fel wiki page mentions mashing a power button.

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19:20 <apritzel> ctag: somewhat confused about that, so to be clear: the FEL pin needs to be tied to GND when the system resets or powers up. It is checked by the BootROM code once, then not considered again during runtime

19:22 <apritzel> also: make sure you use fel-sdboot.bin when generating the TOC0 image: there is no ELF loader or so in the BootROM, so it just needs the pure binary code

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23:57 <ctag> Thanks apritzel! OK, re-made the toc0 file with fel-sdboot.sunxi from the tools repo.

23:59 <ctag> I'm guessing now maybe the FEL pin isn't actually routed out to anything.. When I jumped it to ground nothing really changes.

23:59 <ctag> Turns out the board enumerates as allwinner/FEL for a few seconds when given power normally