Bug #14280

Updated by Toomas Soome 10 months ago

Make sure we do not read from FB in loader, unless we can not allocate shadow buffer. This should improve performance for many systems. 

 Testoing done: build/install/boot, my own test systems do not show great difference, but as with related kernel gfx_private work, there are systems to win from it. Also had positive feedback from FreeBSD specific patch (FreeBSD version is slightly different because of tem and teken callback differences).