Hello,Wolfgang

I'm using u-boot-0.4.8 at Atmel's AT91RM9200-DK machine.Following is information: U-Boot 0.4.8 (Oct 13 2005 - 16:29:32)

U-Boot code: 21F00000 -> 21F13C20 BSS: -> 21F1F9A0 DRAM Configuration: Bank #0: 20000000 64 MB Atmel: AT49BV1614 (16Mbit) Flash: 16 MB In: serial Out: serial Err: serial start linux now(y/n): Uboot>tftp 23000000 zImage Uboot> tftp 20800000 ramdisk.image.gz Uboot> go 23000000

*****I download a image by tftp into board's SDRAM and then start it,just like an old friend say"Now, I wonder if it is possible to start the image under control of gdb. As I understand it, there can run a small 'gdb-stub' on the target which talks by serial line or by ethernet with the gdb on the development host. In common/kgdb.c there seems to be something like this small 'gdb-stub'? Does it work for ARM? How can it be used?"

*********My question is:If I want to add a debugging stub(at91rm9200dk-stub.c or gdbserver)into u-boot-0.4.8,how to do it? Isn't it a difficult task? ************

The following is my U-boot starting linux process infomormation:

start linux... ## Starting application at 0x23000000 ... Uncompressing Linux.............................................................Linux version 2.4.19-rmk7 (root@localhost.localdomain) (gcc version 2.95.3 20015CPU: Arm920Tid(wb) revision 0 Machine: ATMEL AT91RM9200 On node 0 totalpages: 16384 zone(0): 16384 pages. zone(1): 0 pages. zone(2): 0 pages. Kernel command line: initrd=0x20800000,32M root=/dev/ram init=/linuxrc console0Console: colour dummy device 80x30 Calibrating delay loop... 89.90 BogoMIPS Memory: 64MB = 64MB total Memory: 29796KB available (1804K code, 346K data, 76K init) Dentry cache hash table entries: 8192 (order: 4, 65536 bytes) Inode cache hash table entries: 4096 (order: 3, 32768 bytes) Mount-cache hash table entries: 1024 (order: 1, 8192 bytes) Buffer-cache hash table entries: 4096 (order: 2, 16384 bytes) Page-cache hash table entries: 16384 (order: 4, 65536 bytes) POSIX conformance testing by UNIFIX Linux NET4.0 for Linux 2.4 Based upon Swansea University Computer Society NET3.039 Initializing RT netlink socket Starting kswapd Journalled Block Device driver loaded devfs: v1.12a (20020514) Richard Gooch (rgooch@atnf.csiro.au) devfs: boot_options: 0x1 JFFS2 version 2.1. (C) 2001 Red Hat, Inc., designed by Axis Communications AB. S1D13XXX: Phys address:C480F000 Phys Reg address:C480D000 Console: switching to colour frame buffer device 30x20 fb0: s1d13xxx frame buffer device Display 240 x 320 16Bpp pty: 256 Unix98 ptys configured Keyboard(PS/2): initiate successfully!

*********************keybd_init************** Uniform Multi-Platform E-IDE driver Revision: 6.31 ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx ioremap:c4a10000 ide0: CPCI405 IDE interface IDE: waiting for drives to settle... IDE: waiting for drives to settle... IDE: waiting for drives to settle... hdb: probing with STATUS(0x28) instead of ALTSTATUS(0x0e) SLIP: version 0.8.4-NET3.019-NEWTTY (dynamic channels, max=256). CSLIP: code copyright 1989 Regents of the University of California. RAMDISK driver initialized: 16 RAM disks of 15360K size 1024 blocksize PPP generic driver version 2.4.2 SCSI subsystem driver Revision: 1.00 kmod: failed to exec /sbin/modprobe -s -k scsi_hostadapter, errno = 2 kmod: failed to exec /sbin/modprobe -s -k scsi_hostadapter, errno = 2 AT91ARM9200 flash device: 1000000 at 10000000 Search for id:(89 18) interleave(1) type(2) Search for id:(89 18) interleave(1) type(2) Search for id:(89 18) interleave(1) type(2) Search for id:(89 18) interleave(2) type(1) Search for id:(89 18) interleave(2) type(1) Search for id:(89 18) interleave(2) type(1) Search for id:(89 00) interleave(2) type(2) Search for id:(89 00) interleave(2) type(2) Search for id:(89 00) interleave(2) type(2) JEDEC: Found no AT91ARM9200 flash device device at location zero Using buffer write method Creating 4 MTD partitions on "AT91ARM9200 flash device": 0x00000000-0x00040000 : "reserved for bootloader" mtd: Giving out device 0 to reserved for bootloader 0x00040000-0x00140000 : "reserved for kernel" mtd: Giving out device 1 to reserved for kernel 0x00140000-0x00540000 : "reserved for ramdisk" mtd: Giving out device 2 to reserved for ramdisk 0x00540000-0x00d40000 : "jffs2(8M)" mtd: Giving out device 3 to jffs2(8M) physmap flash device: 800000 at 10540000 Using buffer write method mtd: Giving out device 4 to Physically mapped flash usb.c: registered new driver usbdevfs usb.c: registered new driver hub usb.c: registered new driver usb_mouse usbmouse.c: v1.6:USB HID Boot Protocol mouse driver usb.c: registered new driver keyboard usbkbd.c: :USB HID Boot Protocol keyboard driver Initializing USB Mass Storage driver... usb.c: registered new driver usb-storage USB Mass Storage support registered. mice: PS/2 mouse device common for all mice ttyS%d0 at MEM 0xfefff200 (irq = 1) is a AT91_SERIAL ttyS%d1 at MEM 0xfefc0000 (irq = 6) is a AT91_SERIAL ttyS%d2 at MEM 0xfefc4000 (irq = 7) is a AT91_SERIAL ttyS%d3 at MEM 0xfefc8000 (irq = 8) is a AT91_SERIAL ttyS%d4 at MEM 0xfefcc000 (irq = 9) is a AT91_SERIAL eth0: Link now 100-FullDuplex eth0: AT91 ethernet at 0xfefbc000 int=24 100-FullDuplex (00:01:02:03:04:05) usb-ohci.c: USB OHCI at membase 0xc6219000, IRQ 23 usb.c: new USB bus registered, assigned bus number 1 Product: USB OHCI Root Hub SerialNumber: c6219000 hub.c: USB hub found hub.c: 2 ports detected NET4: Linux TCP/IP 1.0 for NET4.0 IP Protocols: ICMP, UDP, TCP IP: routing cache hash table of 512 buckets, 4Kbytes TCP: Hash tables configured (established 4096 bind 4096) NET4: Unix domain sockets 1.0/SMP for Linux NET4.0. NetWinder Floating Point Emulator V0.95 (c) 1998-1999 Rebel.com RAMDISK: Compressed image found at block 0 Freeing initrd memory: 32768K EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended VFS: Mounted root (ext2 filesystem). Mounted devfs on /dev Freeing init memory: 76K mount /etc as ramfs re-create the /etc/mtab entries eth0: Link now 100-FullDuplex mtdblock_open ok jffs2_read_inode(): No data nodes found for ino #85 jffs2_read_inode(): But it has children so we fake some modes for it exec: 5: /jffs2/etc/ipset: Permission denied

Please press Enter to activate this console.

BusyBox v1.00-pre10 (2004.06.15-14:16+0000) Built-in shell (ash) Enter 'help' for a list of built-in commands.

~ # ls application dev jffs2 linuxrc qt usr bin etc lib mnt sbin var bitmap font linuette proc tmp

Please! Thank you very much!

yours peike