IPMI over I2C

[asm4]

Hello,

I am looking into trying to run ipmitool over I2C and was wondering if this is supported. I have a Pi connected via I2C to another device that has a BMC. I have the character device /dev/i2c-1 which I can use to write I2C commands to but I am hoping to be able to send ipmi commands instead. If I connect the Pi and other system both to the same network, I can still send commands over the lanplus interface but I would like to see if I2C is possible.

Most commands I run with ipmitool seem to attempt to open the file /dev/ipmi-N which doesn't exist on my raspberry pi. I checked the driver support in the kernel for getting that (https://www.kernel.org/doc/html/latest/driver-api/ipmi.html) and made sure that my kernel has ipmi_msghandler, ipmi_devintf, and ipmi_ssif. But still no luck. I suspect the issue is that I haven't correctly configured the ipmi_ssif driver on the kernel command line. Am I on the right path with this? I determined the i2c address with i2cdetect -y 1 and it shows up as 0x10. Dumping the file cat /sys/class/i2c-adapter/i2c-1/name shows me that my adapter is bcm2835. This led me to try to add ipmb_ssif.addr=0x10 ipmi_ssif.adapter=bcm2835 ipmi_ssif.dbg=1,2,4,8 ipmi_ssif.dbg_probe=1 to the kernel command line. However, I didn't specify anything for ipmi_ssif.slave_addrs, ipmi_ssif.tryacpi, or ipmi_ssif.trydmi which admittedly could be my problem. I don't know if it could also be just something with the raspberry Pi maybe not having some support for this or something. Any ideas?

I did also looked through some of the other interfaces that ipmitool supports and went down a bit of a rabbit hole with the ipmb-dev-int driver (https://www.kernel.org/doc/html/latest/driver-api/ipmb.html) since that also looked promising and originally mistook it for imb interface. But it doesn't look like ipmitool has that as an interface, is that correct?

I appreciate any insight anyone can provide. Thanks to all who work on ipmitool!

[AlexanderAmelkin]

IPMI over I2C is called IPMB. ipmitool doesn't directly support that, but please take a look at ipmi-host driver by Mellanox. I've never tried it myself and can't guarantee that it will help you, but at the fist glance it looks like it can work with the standard OpenIPMI interface (ipmitool -I open):

https://github.com/Mellanox/ipmb-host

[asm4]

Thank you kindly! I'll definitely look at that.

[testeract-tj]

@asm4 how did this end up for you? I'm looking into using this as well?