Build issues with ipxe.efi for arm64 architecture

[tiger276]

The build for target bin-arm64-efi/snp.efi was successful and also the initial chainload via the UEFI-Firmware.
So that looks good so far.

Code:

iPXE 1.0.0+ (d9886) -- Open Source Network Boot Firmware -- http://ipxe.org
Features: DNS HTTP iSCSI TFTP AoE EFI Menu                                                                                                                                                                        

net0: fc:aa:14:e4:98:38 using SNP on SNP-0x807e894618 (open)                                                                                                                                                      
  [Link:up, TX:0 TXE:0 RX:0 RXE:0]                                                                                                                                                                                
Configuring (net0 fc:aa:14:e4:98:38)..... ok                                                                                                                                                                      
net0: 192.168.0.12/255.255.255.0                                                                                                                                                                                  
Next server: 192.168.0.1                                                                                                                                                                                          
Filename: efi/boot/ipxe/snp.efi                                                                                                                                                                                    
tftp://192.168.0.1/efi/boot/ipxe/snp.efi... ok                                                                                                                                                                    
add-symbol-file snp.efi 0x807CB0B2C0                                                                                                                                                                              
remove-symbol-file snp.efi 0x7CB0B2C0                                                                                                                                                                              
snp.efi : 159872 bytes [EFI]                                                                                                                                                                                      
add-symbol-file snp.efi 0x807CB0B2C0                                                                                                                                                                              
iPXE initialising devices...ok

But the USB keyboard isn't working and PS2 is not possible