The whole process is very easy thanks to Dell's commitment to Linux:
- wget -q -O - http://linux.dell.com/repo/community/bootstrap.cgi | bash
- wget -q -O - http://linux.dell.com/repo/firmware/bootstrap.cgi | bash
- yum -y install libsmbios-bin firmware-tools firmware-addon-dell
- yum -y install $(bootstrap_firmware)
- update_firmware --yes
Don't take my word for it look at Dell's firmware repository information.
I have had success using these steps for Poweredge 2850, 2950, R710, Optiplex GX280, GX520, GX620, Latitude D620 and D630 just to name a few. In addition, OS's have been CentOS 5.x, Fedora 11, 12 and 13.