I've just downloaded the materials for this hot patch, but I have
encountered some problems.

Problem #1: When testing on a Dell GX270 with a e1000, it boots from CD just
fine. But when I boot PXE, it fails to get a DHCP address. I can see that
the network card driver loaded.

How can the same materials succeed at getting a DHCP address when booting
from CD, but fail from PXE?

Other machines that have a e1000 also don't exhibit this problem. It
appears to be limited to the Dell GX 270.

Problem #2: Any machine with 512 MB of memory or less that I try to PXE boot
from fails with a kernel panic. It seems to be the amount of memory that is
the problem, although this may be wrong.