From mboxrd@z Thu Jan 1 00:00:00 1970 From: "John Fisher" To: "'eCos discussion mailing list'" Subject: [ECOS] RE: Power PC Application Date: Mon, 29 Nov 1999 16:18:00 -0000 Message-id: <000001bf3ac8$499adfa0$c5d04c93@jfishernt4.neca.nec.com.au> References: <14403.5508.686402.112185@leda.cygnus.com> X-SW-Source: 1999-11/msg00075.html I also have been trying to get gdb and insight working with BDM and the Macraigor Wiggler, however I am experiencing the following problem with gdb and/or wigglers.dll. I am using the Motorola MPC8xxFADS board. After issuing "target ocd wiggler lpt1" and "ocd reset" from gdb any attempt to write to the MPC860's SYPCR register fails. When the register is read back 0xFFFFFF07 is obtained, which is the boot up value. The reason I am trying to write the SYPCR register is to turn the watchdog off. My first thought was that gdb itself is writing this register and since the register may only be written once following reset, that was the explanation. However gdb writes the register during its target command - before the reset - and since it writes 0xFFFFFF88 it is obviously not succeeding either. I have no trouble writing the SYPCR register when using OCD commander, the debugger available from the Macraigor website. I am taking a slightly different approach from the gdb authors. Writing 0xffffff0f stops the watchdog timer from counting while FRZ is asserted - this is all that should be necessary. The gdb authors disable it entirely by writing 0xffffff88. It appears that gdb and the wiggler are either not resetting the board properly or are writing the default value of the SYPCR register just after reset. Does anyone know whether source is available for wigglers.dll? I have asked at macraigor but received no reply. Here is the transcript of the gdb session: GNU gdb 4.17-ecosSWtools-990319 Copyright 1998 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. This version of GDB is supported for customers of Cygnus Solutions. Type "show warranty" for details. This GDB was configured as "--host=i586-cygwin32 --target=powerpc-eabi". (gdb) set radix 16 Input and output radices now set to decimal 16, hex 10, octal 20. (gdb) target ocd wiggler lpt1 Remote target wiggler connected to wiggler lpt1 [Wiggler version f.20, capability 0x1d] 0x1000 in ?? () (gdb) x 0xff000004 0xff000004: 0xffffff07 (gdb) ocd reset (gdb) print *(unsigned long *)0xff000004 = 0xffffff0f $1 = 0xffffff07 (gdb) x 0xff000004 0xff000004: 0xffffff07 (gdb) x 0xff000004 0xff000004: 0xffffff07 (gdb) quit The program is running. Exit anyway? (y or n) y bash-2.02$ Here is wigglers.log: rewrite LOG 55 F1 01 0E 55 F1 80 00 8F set_connection 55 F0 01 0F 55 F0 80 06 8A initialize_target 55 10 00 50 02 9E 55 10 00 00 F0 set_logging close LOG 55 F1 03 0C append LOG 55 F1 02 0D 55 F1 00 00 0F get_version 55 01 FF 55 01 00 00 00 20 00 1D 00 00 00 00 00 00 C2 set_logging close LOG 55 F1 03 0C append LOG 55 F1 02 0D 55 F1 00 00 0F stop_target 55 22 DE 55 22 04 00 DA set_logging close LOG 55 F1 03 0C append LOG 55 F1 02 0D 55 F1 04 00 0B set_control_flags 55 15 00 01 55 15 04 00 E7 read_register 55 30 00 1A 00 1A 9C 55 30 04 00 04 00 00 10 00 B8 read_register 55 30 08 01 08 01 BE 55 30 04 00 04 00 00 88 7B C5 set_logging close LOG 55 F1 03 0C append LOG 55 F1 02 0D 55 F1 04 00 0B write_register 55 31 00 95 04 20 02 40 00 D4 55 31 04 00 CB write_memory 55 33 FF 00 00 04 01 00 04 FF FF FF 88 40 55 33 04 00 C9 read_memory 55 32 FF 00 00 04 01 04 C6 55 32 04 00 04 FF FF FF 07 C2 reset_and_halt FAST DOWNLOAD ENABLED 55 24 DC 55 24 04 00 D8 set_logging close LOG 55 F1 03 0C append LOG 55 F1 02 0D 55 F1 04 00 0B write_memory 55 33 FF 00 00 04 01 00 04 FF FF FF 0F B9 55 33 04 00 C9 read_memory 55 32 FF 00 00 04 01 04 C6 55 32 04 00 04 FF FF FF 07 C2 read_memory 55 32 FF 00 00 04 01 04 C6 55 32 00 00 04 FF FF F John Fisher Transmission Systems Division NEC Australia Pty Ltd 649 Springvale Road Mulgrave Vic 3170 Australia email: jfisher@tns.neca.nec.com.au ph: + 613 9264 3606 fax: + 613 9264 3892