Thanks all for the help with the toolchain -- I'm now cranking out ppc code.
Now to boot. What I'm actually trying to do is replace a VxWorks environment on one of my companies products with Linux. The unit is 405GP based, and pretty close to a walnut, as far as I can tell (comparing the mem map in the docs with the 405gp.h file in the kernel). I'm hoping to get away with using the existing boot monitor, at least in the short term. The monitor has the ability to load an ELF executable & jump to it, but I'm not getting very far beyond that -- in fact it crashes with the pc at the first instruction. I've tried my freshly-built 2.4.18 kernel, and the ppcboot executable, and they both crash on the first instruction. I don't have a hardware debugger for this, so I'm sort of at a loss. There are some LED's on the front that I could try & write some asm to blink as I go along, but since I hang on the first instruction, I'm not sure that would help....... All thoughts greatly appreciated. dave. Dumps: Linux: ftp 134.141.133.254:vmlinux to SDRAM size=1430968 Booting system S/W at entry 0xc0000000 Starting at 0xc0000000... program Exception current instruction address: 0xc0000000 Machine Status Register: 0x00029200 Condition Register: 0x24200082 Task: 0x1f1a8e0 "tBoot" r0 = c034dc sp = 1f1a4d0 r2 = 0 r3 = 0 r4 = 1f80000 r5 = 1f1a8e0 r6 = 29200 r7 = 1200 r8 = 20 r9 = ca0000 r10 = 4 r11 = 0 r12 = 0 r13 = 0 r14 = 0 r15 = 0 r16 = 0 r17 = 0 r18 = 0 r19 = 0 r20 = 0 r21 = 0 r22 = 0 r23 = 0 r24 = 0 r25 = 0 r26 = 0 r27 = ca0000 r28 = ca0000 r29 = c0000000 r30 = 1ffffc8 r31 = c0000000 msr = 29200 lr = c034e4 ctr = 0 pc = c0000000 cr = 24200082 xer = 0 ppcboot: ftp 134.141.133.254:ppcboot to SDRAM size=186232 + 4 Booting system S/W at entry 0xfff80000 Starting at 0xfff80000... program Exception current instruction address: 0xfff80000 Machine Status Register: 0x00029200 Condition Register: 0x24200082 Task: 0x1f1a8e0 "tBoot" r0 = c034dc sp = 1f1a4d0 r2 = 0 r3 = 0 r4 = 1f80000 r5 = 1f1a8e0 r6 = 29200 r7 = 1200 r8 = 20 r9 = ca0000 r10 = 4 r11 = 0 r12 = 0 r13 = 0 r14 = 0 r15 = 0 r16 = 0 r17 = 0 r18 = 0 r19 = 0 r20 = 0 r21 = 0 r22 = 0 r23 = 0 r24 = 0 r25 = 0 r26 = 0 r27 = ca0000 r28 = ca0000 r29 = fff80000 r30 = 1ffffc8 r31 = fff80000 msr = 29200 lr = c034e4 ctr = 0 pc = fff80000 cr = 24200082 xer = 0 Objdump says: [dstrout at dstrout dstrout]$ ~/tools/bin/powerpc-linux-objdump -D ppcboot | head -20 ppcboot: file format elf32-powerpc Disassembly of section .resetvec: fffffffc <.resetvec>: fffc: 4b f8 01 04 b fff80100 <_start> Disassembly of section .text: fff80000 <version_string-0x4>: fff80000: 27 05 19 56 dozi r24,r5,6486 fff80004 <version_string>: fff80004: 50 50 43 42 rlwimi r16,r2,8,13,1 fff80008: 6f 6f 74 20 xoris r15,r27,29728 fff8000c: 31 2e 31 2e addic r9,r14,12590 fff80010: 35 20 28 4a addic. r9,r0,10314 fff80014: 75 6e 20 20 andis. r14,r11,8224 fff80018: 35 20 32 30 addic. r9,r0,12848 fff8001c: 30 32 20 2d addic r1,r18,8237 [dstrout at dstrout dstrout]$ ~/tools/bin/powerpc-linux-objdump -D vmlinux | head -20 vmlinux: file format elf32-powerpc Disassembly of section .text: c0000000 <_start>: c0000000: 7c 7f 1b 78 mr r31,r3 c0000004: 7c 9e 23 78 mr r30,r4 c0000008: 7c bd 2b 78 mr r29,r5 c000000c: 7c dc 33 78 mr r28,r6 c0000010: 7c fb 3b 78 mr r27,r7 c0000014: 3b 00 00 00 li r24,0 c0000018: 48 00 23 49 bl c0002360 <initial_mmu> c000001c <turn_on_mmu>: c000001c: 38 00 10 32 li r0,4146 c0000020: 7c 1b 03 a6 mtsrr1 r0 c0000024: 3c 00 c0 00 lis r0,-16384 c0000028: 60 00 22 c0 ori r0,r0,8896 c000002c: 7c 1a 03 a6 mtsrr0 r0 ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/