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| 06:54.57 | aproemel | morning |
| 06:55.17 | aproemel | does anybody know how to create absolute code with gnu assambler for ARM9TDMI ? |
| 06:57.55 | ka6sox-laptop | not done that... |
| 07:42.37 | aproemel | mhh, well but it have to work |
| 09:09.51 | vmaster | you mean 'absolute' as opposed to 'position independent'? |
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| 09:44.06 | aproemel | vmaster: my problem is, my arm9tdmi won't work correctly |
| 09:44.22 | aproemel | i toglle a IO pin until I enter a infinite loop |
| 09:44.41 | aproemel | and get every 7us a trigger signal on this IO pin |
| 09:44.56 | aproemel | i thought, that it could be a false branch |
| 09:45.15 | aproemel | but now, i checked the opcode of the branch an it seems to be correct |
| 09:51.06 | vmaster | can you show me the code? |
| 09:52.48 | aproemel | sure |
| 09:52.59 | aproemel | i'll send you the listing |
| 09:55.01 | aproemel | http://rafb.net/p/b7n2vo59.html |
| 09:55.27 | aproemel | but a few comments are in german, sorry |
| 09:56.05 | vmaster | heh, no problem for me, look at my ip ;) |
| 09:57.37 | vmaster | ok, but that's just the assembled object file, right? |
| 09:58.19 | aproemel | yes |
| 09:59.17 | aproemel | i'm currently build my adapter circuit for jtagkeytiny |
| 09:59.20 | vmaster | and how do you process it before you put it on the target? |
| 10:00.09 | aproemel | arm-9tdmi-linux-gnu-as -mcpu=arm920t -march=armv4t -EL start.s -o start.o |
| 10:00.20 | aproemel | and then i put the start.o to my device via Xmodem |
| 10:01.37 | vmaster | using the AT91's built-in bootloader? |
| 10:01.45 | aproemel | yes |
| 10:02.16 | vmaster | are you sure your file gets run? that's an ELF object file, with a header and all kinds of stuff definitely not suited for execution |
| 10:03.04 | vmaster | normally, the next step would be to link that object file, resulting in an ELF executable, which you then run through objcopy to get a "binary", i.e. a memory image |
| 10:04.03 | aproemel | the file runs, it toggles the leds |
| 10:04.18 | aproemel | but, i think it "restarts" after 7uS |
| 10:04.48 | aproemel | vmaster: how does the linking work? |
| 10:04.59 | aproemel | maybe thats my fault |
| 10:06.01 | aproemel | you're right a file of led.o gets ELF 32-bit LSB relocatable, ARM, version 1 (ARM, not stripped |
| 10:09.40 | vmaster | you have to a write a linker script, then run arm-xxx-ld -t <linker-script> <input-files> <output-file> |
| 10:10.05 | aproemel | ok, thanks |
| 10:43.48 | aproemel | vmaster: it seems that it doesn't work |
| 10:44.57 | aproemel | http://rafb.net/p/6HXD4M27.html |
| 10:47.44 | aproemel | vmaster: i'm such an Idiot |
| 10:47.46 | aproemel | it works fine |
| 10:47.47 | aproemel | THANKS |
| 10:51.28 | vmaster | just a note: you're currently linking at 0x0, but the internal SRAM is located at 0x200000 after a reset |
| 10:52.44 | vmaster | you can remap the SRAM to 0x0, but I didn't see that in your code |
| 10:52.53 | vmaster | also, the PC is going to be in the 0x20xxxx range |
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| 11:15.59 | aproemel | so i have to remap or link to 200000 ? |
| 11:30.48 | vmaster | well, actually both |
| 11:31.19 | vmaster | you have to remap to get RAM at 0x0, were the exception vectors are, otherwise you can't have exception handlers |
| 11:32.43 | vmaster | you /could/ link to 0x0, and add a branch instruction that branches from the 0x200000 area to 0x0 (i think it should be -0x200008 as the PC is read as +8) |
| 11:33.22 | aproemel | vmaster: atm i wont get exeptions |
| 11:33.46 | vmaster | but imho it would be better to have your code run at 0x20000, remap the ram to 0x0 (it's still going to be at 0x200000, too), and copy the exception vectors to 0x0 |
| 11:34.05 | aproemel | i linked it to 20000 right now |
| 11:34.25 | vmaster | aproemel: even if you have no interrupts you could raise an abort or undef exception |
| 11:35.35 | aproemel | so i have to remap, ok |
| 11:36.47 | aproemel | at which point on my code you would prefer to remap ? |
| 11:38.08 | aproemel | i only have internal memory and external SDRAM |
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| 11:42.15 | vmaster | you usually set up the exception vectors early during startup |
| 11:43.36 | vmaster | if you change your startup code a bit, the remapping gets a lot easier |
| 11:43.43 | aproemel | vmaster: i thinkt after download completion the memory is remapped |
| 11:44.51 | aproemel | or do i have to remap then manually? |
| 11:45.06 | vmaster | ah, ok, just checked the manual, you're right |
| 11:45.18 | vmaster | your code is executing from 0x0, and remap already occured |
| 11:45.32 | aproemel | but already located at 0x20000 too |
| 11:46.16 | vmaster | yeah, the internal SRAM is always at 0x200000, but additionally remapped to 0x0 to hold the exception vectors, and the on-chip bootloader, lets you execute from 0x0 |
| 11:46.32 | aproemel | ok, then its correct :-) |
| 11:47.41 | aproemel | I'm very confused today :-( |
| 11:48.46 | vmaster | heh, yeah, sorry I added to that confusion |
| 11:48.58 | aproemel | no problem, you helped me a lot |
| 11:49.50 | aproemel | Question for Jtagkey tiny: Amontec gives a windows IDE, GAT and OCD |
| 11:49.54 | aproemel | is there a linux one too ? |
| 11:53.48 | vmaster | Eclipse is available on linux, i have no idea what "GAT" is, and the OpenOCD works on Linux just fine (I developed it on Linux) |
| 11:54.36 | aproemel | ok :-) |
| 11:55.31 | aproemel | well im stupod gat = gnu arm toolchain |
| 11:55.53 | vmaster | ah, hehe, ok |
| 11:56.05 | vmaster | well, as you probably already know that one is available on linux, too |
| 11:56.19 | aproemel | :-P yes ^^ |
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