Date: Mon, 11 Jun 2018 04:33:20 +0300                                                                                               
From: Valery Ushakov <uwe@stderr.spb.ru>                                                                                            
To: port-macppc@NetBSD.org                                                                                                          
Cc: Christos Zoulas <christos@netbsd.org>                                                                                           
Subject: Netbooting mac mini g4                                                                                                     
                                                                                                                                    
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I've finally got around to investigate how to netboot mac mini g4 as I                                                              
promised Christos (quite) a while ago.                                                                                              
                                                                                                                                    
OFW in that machine *really* wants to talk Apple's BSDP it seems.                                                                   
Attached is the sekeleton dhcpd.conf that seems to make it happy.                                                                   
There are still two ~15 seconds delays in the process, but that is                                                                  
tolerable.                                                                                                                          
                                                                                                                                    
The idea is from                                                                                                                    
                                                                                                                                    
  http://brandon.penglase.net/index.php?title=Getting_*nix_to_Netboot_Macs                                                          
                                                                                                                                    
but expressed properly using dhcpd option defintions instead of bunch                                                               
of hex.                                                                                                                             
                                                                                                                                    
-uwe                                                                                                                                
                                                                                                                                    
[-- Attachment #2: dhcpd.conf --]                                                                                                   
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subnet 192.168.42.0 netmask 255.255.255.0 {                                                                                         
  authoritative;                                                                                                                    
  range 192.168.42.200 192.168.42.250;                                                                                              
  next-server = config-option dhcp-server-identifier;                                                                               
}                                                                                                                                   
                                                                                                                                    
# Defintions for Apple's Boot Server Discovery Protocol (BSDP)                                                                      
option space BSDP;                                                                                                                  
option BSDP.message-type        code 1 = unsigned integer 8;                                                                        
option BSDP.version             code 2 = unsigned integer 16;                                                                       
option BSDP.server-identifier   code 3 = ip-address;                                                                                
option BSDP.server-priority     code 4 = unsigned integer 16;                                                                       
option BSDP.reply-port          code 5 = unsigned integer 16;                                                                       
                                                                                                                                    
# Implement dummy BSDP interaction to keep OFW happy                                                                                
class "Apple-BSDP" {                                                                                                                
  match if substring (option vendor-class-identifier, 0, 10) = "AAPLBSDPC/";                                                        
  vendor-option-space BSDP;                                                                                                         
                                                                                                                                    
  if (option dhcp-message-type = 8) {   # DHCP INFORM                                                                               
    option vendor-class-identifier "AAPLBSDPC";                                                                                     
                                                                                                                                    
    parse-vendor-option;                                                                                                            
                                                                                                                                    
    # reply with an empty list                                                                                                      
    if (option BSDP.message-type = 1) { # BSDP LIST                                                                                 
      log(info, "BSDP_LIST");                                                                                                       
      option BSDP.message-type 1;                                                                                                   
      option BSDP.server-identifier = config-option dhcp-server-identifier;                                                         
      option BSDP.server-priority 32768;                                                                                            
    }                                                                                                                               
                                                                                                                                    
    # just ack SELECT                                                                                                               
    elsif (option BSDP.message-type = 2) { # BSDP SELECT                                                                            
      log(info, "BSDP_SELECT");                                                                                                     
      option BSDP.message-type 2;                                                                                                   
    }                                                                                                                               
  } # INFORM                                                                                                                        
}                                                                                                                                   
                                                                                                                                    
host snips {                                                                                                                        
  hardware ethernet 00:11:24:6f:0f:e6;                                                                                              
  fixed-address 192.168.42.199;                                                                                                     
  filename "ofwboot.elf";                                                                                                           
  option root-path "/export/root/snips";                                                                                            
}