Access Intel ME IPMB from BMC

[Oskar Senft]

Thanks again!

ipmbbridge solved my problem. I found that my version of OpenBMC (incl.
kernel) used a slightly older version of ipmbbridge which still used the
i2c slave mqueue, which worked fine. Reading a bit of source code made it
clear how it worked. The key is to configure ipbm-channels.json with the
correct i2c device and the rest "just works".

For the benefit of others: My understanding is that the current version of
ipmbbridge no longer uses the i2c slave mqueue but requires the ipmb-dev
driver in the kernel. It's not necessary to actually attach the driver to
an i2c device as that can happen at runtime.

Oskar.


On Mon, Apr 20, 2020 at 4:34 PM Vijay Khemka <vijaykhemka at fb.com> wrote:

> Hi Oskar,
>
> You need to use ipmb-dev driver which is is being used by ipmbbridge. You
> don’t need ipmb-host as we are having ipmbbridge to replace that.
>
>
>
> Regards
>
> -Vijay
>
>
>
> *From: *Oskar Senft <osk at google.com>
> *Date: *Monday, April 20, 2020 at 11:35 AM
> *To: *Vijay Khemka <vijaykhemka at fb.com>
> *Cc: *OpenBMC Maillist <openbmc at lists.ozlabs.org>
> *Subject: *Re: Access Intel ME IPMB from BMC
>
>
>
> Hi Vijay
>
>
>
> Thanks for the pointer!
>
>
>
> I also found both https://github.com/Mellanox/ipmb-host and
> https://github.com/openbmc/linux/blob/dev-5.4/drivers/char/ipmi/ipmb_dev_int.c
> .
>
>
>
> Is it right that with ipmbbridge I don't need either of them since
> ipmbbridge uses the raw i2c dev?
>
>
>
> Thanks
>
> Oskar.
>
>
>
> On Mon, Apr 20, 2020 at 2:12 PM Vijay Khemka <vijaykhemka at fb.com> wrote:
>
> Hi Oskar,
>
> You need to configure your ME channel in ipmb channel config file
> https://github.com/openbmc/ipmbbridge/blob/master/ipmb-channels.json
>
> And make sure ipmbbridge is running. Then you can send get device id
> command to ME from command line itself to test if everything is working.
>
>
>
> busctl call xyz.openbmc_project.Ipmi.Channel.Ipmb
> /xyz/openbmc_project/Ipmi/Channel/Ipmb org.openbmc.Ipmb sendRequest yyyyay
> 1 6 0 0x1 0
>
>
>
> Regards
>
> -Vijay
>
>
>
> *From: *openbmc <openbmc-bounces+vijaykhemka=fb.com at lists.ozlabs.org> on
> behalf of Oskar Senft <osk at google.com>
> *Date: *Saturday, April 18, 2020 at 6:47 PM
> *To: *OpenBMC Maillist <openbmc at lists.ozlabs.org>
> *Subject: *Access Intel ME IPMB from BMC
>
>
>
> Hi everyone
>
>
>
> I'm trying to find out how I can access the Intel ME via IPMB from the BMC
> (OpenBMC).
>
>
>
> From what I gathered, Intel ME's IPMB is on the PCH's SMLink0. I know this
> is connected to one of the SMBus modules on my AST2500. But what I can't
> find out is how I actually send commands there? I'm sure I'm missing a
> document that makes this obvious.
>
>
>
> Or is it as simple as dropping IPMI packets onto the bus?
>
>
>
> Is this by any chance already implemented in OpenBMC?
>
>
>
> Thanks for any hints!
>
>
>
> Oskar
>
>
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