My network adapter is an Intel 82551IT. I'm building the system with Buildroot.
I can modprobe e100, but ifup -a fails with the error : "Failed to load firmware e100/d102e_ucode.bin".
As a matter of fact, the file is not present on my system. So, how do I get it ?
The solution was to select the linux-firmware package in Buildroot.
Then :
$ cp -r <BUILD_DIR>/linux-firwmare-<version>/e100 <OUTPUT>/target/lib/firmware