#linux-sunxi on 2022-04-12 — irc logs at oftc.irclog.whitequark.org

2022-03-22 11:56 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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12:05 <montjoie> smaeul: just some fun, git describe on your linux sources give 4.13-rc7 even it is a 5.18

12:05 <montjoie> I dont understand why

12:10 <wens> do you fetch new tags?

12:11 <wens> git describe uses the latest tag in your branch history

12:12 <montjoie> I did a git fetch --tags

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13:15 <montjoie> I got something very strange with crypto engine, destination buffer being corrupted when DMA flush is done

13:15 <montjoie> on D1

13:17 <montjoie> does a9c3 is a know pattern of something ?

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14:55 <montjoie> ok confirmed that DMA on D1 corrupts buffers

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14:58 <mripard> are the coherency patches merged yet?

15:00 <montjoie> I use the Linux source from smaeul

15:01 <montjoie> is this a known problem ?

15:04 <mripard> I'm not sure if his branch has that issue yet, but DMA is pretty much non-functional on the D1 at the moment if these patches haven't been merged.

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15:07 <mripard> https://lore.kernel.org/linux-riscv/20220307224620.1933061-1-heiko@sntech.de/

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15:12 <montjoie> it seems that the tree got it

15:13 <montjoie> anyway DMA works, the only problem is the buffer beiing corrupted

15:15 <karlp> doesn't really sound like "works" then IMO :)

15:20 <mripard> montjoie: which is what cache management is all about :)

15:21 <mripard> making sure the cache in the CPU is in a consistent with the buffer content in the RAM that is supposed to be accessed by DMA

15:22 <montjoie> probably it is worth saying this to patch owner

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17:12 <machinehum> Is the Allwinenr V5 thumb2 or ARM instruction set? The datasheet makes it seem like both https://imgur.com/a/MxyDvOD

17:13 <karlp> should be both, like all -a class.

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17:36 <machinehum> What would one set this to? https://imgur.com/a/3jqua7A

17:36 <machinehum> karlp: Thanks

17:39 <karlp> iirc, it doesn't matter, just remember what else you will be building. there's instructions for switching and flags for compilers to generate the interworking.

17:39 <karlp> personally, I'd start with a defconfig from something ~similar and then just leave it as is :)

17:39 <machinehum> cool

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