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Re: Identifying diskless computers

From: Andrei Borzenkov
Subject: Re: Identifying diskless computers
Date: Fri, 24 Jun 2016 06:32:07 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0

24.06.2016 00:16, address@hidden пишет:
> I am using a USB drive with grub to boot up a few diskless computers. Is
> there a way for grub to know which of the computers it is running on? To
> be able to automatically pick the right kernel & initrd on the USB key.
> Ethernet controllers happen to have different vendor:device in lspci
> outputs. Is it possible to test the match in a grub script?

TBH, it is easier to simply include all needed ethernet drivers in
kernel initrd and let it to automatically select the right one.

Otherwise you can do something like

set vendor=
setpci -v vendor -d <VENDOR>:<DEVICE> VENDOR_ID
if [ "x$vendor" = x<VENDOR> ] ; then
  echo found device

where VENDOR_ID is literal name for PCI register. setpci will search
through all PCI devices, take the first one matching "-d" argument and
assign value of selected register to variable (specified by "-v"
argument). Value is represented as hexadecimal integer without leading
zeros (if you omit "-v" it should just print them).

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