frec

MIPS处理器的bootloader,龙芯就是用的修改过的PMON2

FastLoad Format
FastLoad Format

The FastLoad Format uses a compressed ASCII format that permits files 
to be downloaded in less than half the time taken for Motorola S-records. 

The base-64 encoding used is "A-Za-z0-9,.". The data is encoded in
groups of 4 characters (24 bits). The character '/' is used to
introduce a special function. Special functions are:

 
 A......
	Defines an address.
	
 B..
	Define a single byte.
	
 C....
	Compare the checksums
	
 EAA
	Define the program's entry point. The address will be the
	current address as defined by the 'A' command.
	
 KAA
	Clear the checksum.
	
 S.....,X
	Define a symbol.  The address of the symbol will be the
	current address as defined by the 'A' command. 
	
 Z..
	Clear a number of bytes.
	

Examples:

      /ACgAgAA        - addr = a0020000
      /ZAI            - clear 8*3=24 bytes
      /EAA            - define entry at 'addr' and exit
      AAABAAAC        - 00 00 01 00 00 02
      /Sfred,X        - symbol = 'addr'
      /BAB            - byte of 01

Generating FastLoad format files

The PMON source package contains two mechanisms for generating
FastLoad format files.