[Bug 274976] [handbook] Chapter 34.10. Diskless Operation with PXE needs improvement

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274976

            Bug ID: 274976
           Summary: [handbook] Chapter 34.10. Diskless Operation with PXE
                    needs improvement
           Product: Documentation
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Books & Articles
          Assignee: doc@FreeBSD.org
          Reporter: cc@FreeBSD.org

The FreeBSD handbook (Chapter 34.10. Diskless Operation with PXE) on installing
FreeBSD via PXE is a good and efficient resource. For my work on the iwlwifi
project, I need to install FreeBSD 13.2 via PXE on some of the Beelink SER5 AMD
Mini PCs, which have a Realtek PCIe GB Ethernet port and can do UEFI PXE boot
in default. Here are some problems that I encountered during the installation
and the solutions that I found. I wish the handbook (Chapter 34.10. Diskless
Operation with PXE) can be updated to reflect the solution.

problems shown in /var/log/xferlog
* tftpd: Got ERROR packet: User aborted the transfer: I think the default
boot/pxeboot file from the base system is used for the legacy PXE, not used for
UEFI PXE. So my mini PC can’t be PXE booted by this file. The solution is to
replace the boot/pxeboot file with the boot/loader.efi file. Like this:

# chroot ${NFSROOTDIR}
# mv boot/pxeboot boot/pxeboot.orig
# cp boot/loader.efi boot/pxeboot

* tftpd: Got ERROR packet: User provided memory block is too small: I think the
default tftp blocksize 512 is too small, change the tftp setup in
/etc/inetd.conf to use a larger block size:

tftp    dgram   udp     wait    root    /usr/libexec/tftpd      tftpd blocksize
1468 -l -s /b/tftpboot

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