Am Mo., 15. Juni 2020 um 22:27 Uhr schrieb Gregg Levine <gregg.drwho8@gmail.com>:
Initialized empty Git repository in /usr/src/lobos/work4/coreboot/.git/
fatal: https://review.coreboot.org/coreboot.git/info/refs download
error - The requested URL returned error: 406
root@pike7:/usr/src/lobos/work4# clear
root@pike7:/usr/src/lobos/work4# git --version
git version 1.6.1.3
root@pike7:/usr/src/lobos/work4#

And that's my Git version. Last time I had Slackware-12.2 up it did work.
That git version is from 2009. The world didn't stop turning.
It's surprising enough that your system has support for sufficiently new SSL that it could receive that HTTP error instead of already failing at the SSL handshake.

tl;dr: update your system.


Patrick
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