readme.mon

宇航级微处理器LEON2 2.2 VHDL源代码,很难找的.

PMON simple S-record monitor, 13-10-2000
-------------------------------------------

Introduction
------------

Pmon is a simple monitor that can be placed in an on-chip boot prom,
external prom or cache memories (using the boot-cache configuration). 
Two versions are provided, one to be used for on-chip prom or caches
(bprom.c) and one for external proms (eprom.c). The on-chip version
automatically detects attached memory and configures the memory
controller register (2). The external version (eprom.c) needs to
be edited first to reflect the current board configuration.

Compilation
-----------

First edit the board-specific parameters in the beging of eprom.c
Then compile the monitors with:

   sparc-rtems-gcc -nostdlib -nostdinc -O2 -Ttext 0 eprom.c -o eprom
   sparc-rtems-gcc -nostdlib -nostdinc -O2 -Ttext 0 bprom.c -o bprom

To generate a binary image to be used by rom2vhdl, convert as follows:

   sparc-rtems-objcopy -O binary bprom bprom.bin
  

Conversion to your prom/cache format is left to the user. Note
that you can use sparc-rtems-objcopy to convert PMON to S-records:

   sparc-rtems-objcopy -O srec eprom eprom.srec


Usage
-----

The monitor writes a boot message on UART1 transmitter and then 
waits for S-records to be downloaded on UART1 receiver. It 
recognises two types of S-records: memory contents and start
address. A memory content S-record is saved to the appropriate
address in memory, while a start address record will cause the
monitor to jump to the indicated address. Applications
compiled with LEONCCS (a.out) can be converted to a suitable S-record
stream with:

sparc-rtems-objcopy -O srec --adjust-vma=0x40000000 --set-start=0 app app.srec

Future ELF versions of LEONCCS will not need the vma adjustments.

Good luck, Jiri.

([e-mail])