FreeBSD's tftpd and tftpd-hpa

Oops just noticed....

So, for the archives (only two months later!), you can use 'mode octet'
(aka 'mode binary') to can work around this issue.

...but how do I get this to work in a PXE environment?
Are you using tftp manually to transfer the pxeboot program?
If so, I would imagine that
tftp> mode binary
tftp> get pxeboot
would do it.
If this is not your situation, you must explain more in detail.