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| 16:27.30 | MrMc | is it possible to use gta2 board with a biger LCD touch sceen? |
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| 17:46.00 | *** topic/#openmoko is Openmoko Mobile Phone Hardware users | WikiReader channel #openmoko-wikireader | Developers channel #openmoko-cdevel | German folks channel #openmoko-de | New Users read http://wiki.openmoko.org + http://www.catb.org/~esr/faqs/smart-questions.html | chanlogs: ~logs | distro-specific channels: #qtmoko, #android-on-freerunner, #openmoko-debian |
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| 18:16.24 | txorlings | Hi! I would like to know how to debug interrupts in my Neo Freerunner with the debug board. Thanks in advance. |
| 18:16.59 | PaulFertser | txorlings: placing a breakpoint in gdb might work. How does it fail? |
| 18:32.02 | txorlings | PaulFertser, I put a breakpoint on 0x18 addr, theoretical ARM fetches that addr when entering IRQ, but the breakpoint never get entered. |
| 18:32.36 | txorlings | PaulFertser, I need to install there an instuction to jump to my interrupt routine, right? |
| 18:33.35 | PaulFertser | txorlings: i suggest other way: |
| 18:33.45 | PaulFertser | txorlings: you load your real elf file in gdb |
| 18:33.53 | PaulFertser | txorlings: and set breakpoint by using function name. |
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| 18:35.31 | txorlings | PaulFertser, I already did it, ISR is never executed. but interrupt controller registers shows that there is an interrupt to be served. |
| 18:36.02 | PaulFertser | txorlings: do you mean you see the pending bit and it doesn't go away? Probably your IRQ is just masked then? |
| 18:36.12 | PaulFertser | txorlings: e.g. not enabled on something like that? |
| 18:37.01 | txorlings | PaulFertser, All control bits are configured right, the pending bit is there. |
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| 18:37.38 | txorlings | PaulFertser, I suspect that on enterint IRQ mode, the trapoline to the ISR is not configured right. |
| 18:37.54 | PaulFertser | txorlings: can you turn on a led in irq or something like that to be sure the irq is really never executed? |
| 18:38.10 | PaulFertser | txorlings: hm, but you can check the trampoline with gdb. |
| 18:38.24 | PaulFertser | txorlings: disassemble *0x18,+4 |
| 18:38.41 | txorlings | PaulFertser, Mmm I don't know how, I am working now with serial Tx using interrupts. |
| 18:38.51 | txorlings | PaulFertser, 0x00000018 0xe59ff018 LDR r15, [r15, #0x18] |
| 18:39.18 | txorlings | PaulFertser, I didn't laready studied what this instruction means... |
| 18:39.31 | txorlings | PaulFertser, Who is r15? PC? |
| 18:39.47 | txorlings | PaulFertser, (just guessing, let me read it! ;) |
| 18:40.27 | txorlings | PaulFertser, Right, it's PC. |
| 18:44.41 | txorlings | PaulFertser, Your command (arm disassemble 0x18 +4) on openocd returned: |
| 18:44.45 | txorlings | 0x00000018 0xe59ff018 LDR r15, [r15, #0x18] |
| 18:44.45 | txorlings | 0x0000001c 0xe59ff018 LDR r15, [r15, #0x18] |
| 18:44.45 | txorlings | 0x00000020 0x00000000 ANDEQ r0, r0, r0 |
| 18:44.45 | txorlings | 0x00000024 0x00000000 ANDEQ r0, r0, r0 |
| 18:46.11 | PaulFertser | txorlings: are you sure that should be a trampoline really? on cortex-m it's just an address. |
| 18:50.53 | txorlings | PaulFertser, I readed it on the datasheet, it says that on entering IRQ mode, after doing some things with regiters. it fetches the 0x18 addres to PC. That is a trampoline, isn't it? |
| 18:51.50 | txorlings | PaulFertser, Can I debug that 0x18 address is accessed? |
| 18:52.17 | PaulFertser | txorlings: yes, looks like it. cortex-m3 has vectored interrupt controller (nvic) |
| 18:54.22 | PaulFertser | txorlings: hm, reading the ARM manual i conclude placing a breakpoint on 0x18 should work |
| 18:55.09 | txorlings | PaulFertser, On GDB or on openocd? |
| 18:55.41 | txorlings | PaulFertser, I I thought the same |
| 18:56.02 | PaulFertser | txorlings: doesn't matter. Unless "high vectors" are enabled which would change the vector address to 0xffff0018 |
| 18:57.33 | txorlings | PaulFertser, Wow! "high vectors"?? Let me check! |
| 18:59.39 | txorlings | PaulFertser, Where that are enabled? |
| 19:01.56 | PaulFertser | txorlings: ARM DDI 0100E chapter 2.6.9 |
| 19:02.50 | txorlings | PaulFertser, That is the datasheet for s3c2442b? |
| 19:03.26 | txorlings | PaulFertser, I reset it to boot on QtMoko and it stopped at 0xffff0018! |
| 19:04.23 | PaulFertser | txorlings: no that's ARM Architecture reference manual |
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| 19:09.48 | txorlings | PaulFertser, Which is the ARM reference manual for Neo Freerunner? I have one but I am not sure that is the right one. Its title is "ARM Architecture Reference Manual". |
| 19:12.07 | PaulFertser | txorlings: arm manuals come with exact marking. I'm reading "ARM DDI 0100E" and it looks like it's applicable. |
| 19:15.50 | txorlings | PaulFertser, I get the mark, mine is "ARM DDI 0100I". |
| 19:16.09 | PaulFertser | txorlings: I guess yours is fine, just newer. |
| 19:16.25 | txorlings | PaulFertser, I see that bit I on the CPSR is enabled -> Interrupts disabled |
| 19:16.39 | txorlings | PaulFertser, Maybe that is the problem! :) |
| 19:16.46 | PaulFertser | txorlings: :)) |
| 19:16.54 | PaulFertser | txorlings: might be |
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