Hello,Wolfgang Denk
At first,Thank you for you give me some advice.Now,I'm using the u-boot- 1.1.4 as bootloader for AT91RM9200DK and arm linux 2.6.14-rc2.However,the old question is:If I want to add a debugging stub(at91rm9200dk-stub.c or gdbserver)into u-boot-1.1.4,you say "It does work, but requires you to add the missing cpu/*/kgdb.S file, and this is not a difficult task, just a somewhat laborious task."can you give me some details about it? how to write the missing /u-boot-1.1.4/ cpu/at91rm9200/kgdb.S file,i find a kgdb.S file in /u-boot-1.1.4/cpu/ppc4xx , i want to modify it for /u-boot- 1.1.4/cpu/arm920t/at91rm9200. how to do it? The following is /u-boot- 1.1.4/cpu/ppc4xx/kgdb.S source file. /* * Copyright (C) 2000 Murray Jensen Murray.Jensen@cmst.csiro.au * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */
#include <config.h> #include <command.h> #include <ppc4xx.h> #include <version.h>
#define CONFIG_405GP 1 /* needed for Linux kernel header files */ #define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */
#include <ppc_asm.tmpl> #include <ppc_defs.h>
#include <asm/cache.h> #include <asm/mmu.h>
#if (CONFIG_COMMANDS & CFG_CMD_KGDB) /* * cache flushing routines for kgdb */
.globl kgdb_flush_cache_all kgdb_flush_cache_all: /* icache */ iccci r0,r0 /* iccci invalidates the entire I cache */ /* dcache */ addi r6,0,0x0000 /* clear GPR 6 */ addi r7,r0, 128 /* do loop for # of dcache lines */ /* NOTE: dccci invalidates both */ mtctr r7 /* ways in the D cache */ ..dcloop: dccci 0,r6 /* invalidate line */ addi r6,r6, 32 /* bump to next line */ bdnz ..dcloop blr
.globl kgdb_flush_cache_range kgdb_flush_cache_range: li r5,CFG_CACHELINE_SIZE-1 andc r3,r3,r5 subf r4,r3,r4 add r4,r4,r5 srwi. r4,r4,CFG_CACHELINE_SHIFT beqlr mtctr r4 mr r6,r3 1: dcbst 0,r3 addi r3,r3,CFG_CACHELINE_SIZE bdnz 1b sync /* wait for dcbst's to get to ram */ mtctr r4 2: icbi 0,r6 addi r6,r6,CFG_CACHELINE_SIZE bdnz 2b SYNC blr
#endif /* CFG_CMD_KGDB */
Please help me! Thank you very much!
Best regards, peike