On Tuesday, 17 May 2022 13:43:55 CEST Сергей Фёдоров wrote: > On the advice of Diederik de Haas (didi.debian@xxxxxxxxx ) on May 16 at > 22:41 I am sending you my message in > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1001286 That bug report and https://bugs.debian.org/1001286 do contain the full history, but it looks like the most interesting/actionable part of that conversation wasn't shared with upstream. I have no specific knowledge about this issue, but will try to summarize it. /var/log/kern.log [ 1.341085] i801_smbus 0000:00:1f.3: SMBus using PCI interrupt [ 1.341467] i2c i2c-0: 8/8 memory slots populated (from DMI) [ 1.341470] i2c i2c-0: Systems with more than 4 memory slots not supported yet, not instantiating SPD On Monday, 16 May 2022 20:55:20 CEST Сергей Фёдоров wrote: > 1. Systems with more than 4 memory slots not supported yet, not > instantiating SPD. Now I have made it so that the system sees 8 slots, as > described below, but I do not see SPD. > > 2. Kingston memory slots do not appear on the I2C bus, although I see them > in the BIOS and can change their parameters. Nevertheless, Linux works > fine. > I rebuilt the kernel by changing to > "./linux-source-5.17.6-1/drivers/i2c/i2c-smbus.c" > > line 358: > if (slot_count > 4) { > dev_warn(&adap->dev, > "Systems with more than 4 memory slots not > supported yet, not instantiating SPD\n"); return; > } > > and replace with > > if (slot_count > 8) { > dev_warn(&adap->dev, > "Systems with more than 8 memory slots not > supported yet, not instantiating SPD\n"); return; > } To which I responded: The 4 slot limit was specified in 5ace60859e84113b7a185c117fbf2c429d381b59 (upstream commit ID) and the secondary commit message had this: "Start with just DDR2, DDR3 and DDR4 on x86 for now, and only for systems with no more than 4 memory slots. These limitations may be lifted later." That commit by Jean Delvare was from ~2 years ago and it appears that there may now be a reason to lift/change that limit of 4 (to 8) As such a change should be discussed (and possibly implemented) upstream, I asked to forward the request there/here. Hopefully you now do have the needed information. Cheers, Diederik
Attachment:
signature.asc
Description: This is a digitally signed message part.
