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| 22:44.11 | johnrw | hello... I pulled from openocd svn last night... and whoah... some nice new xscale commands... |
| 22:47.40 | johnrw | but I am facing a problem when I try and boot a kernel... which is in itself a bootloader. If I do a reset halt, then a resume... it still winds up dying with the pc=0xffff0018... |
| 22:49.39 | johnrw | I have posted a help! on the openocd forum at sparkfun... titled XScale: setting hw breakpoint in Linux kernel possible? |
| 22:50.31 | prpplague | johnrw: how/why are you trying to u se a linux kernel as a bootloader? |
| 22:51.05 | johnrw | It's a very long story |
| 22:51.52 | prpplague | because i can see using the linux kernel as a second stage loader, but not as a primary |
| 22:52.10 | johnrw | Bought router... It can't handle a hard drive that goes to sleep... because of a crappy linux implementation... by a company named Jungo |
| 22:52.41 | johnrw | Whe the hard disk goes into sleep mode... that linux kernel thinks the superblock has been corrupted... |
| 22:53.04 | johnrw | \and refuses access to the drive... |
| 22:53.21 | johnrw | so it lasts for about 15 minutes... |
| 22:53.24 | johnrw | lol |
| 22:53.26 | drath | johnrw: you need to place a hw breakpoint at the point where the exception vectors get re-written |
| 22:53.31 | johnrw | That was day 1 |
| 22:53.33 | prpplague | so why no replace the kernel with one that works? |
| 22:53.35 | drath | johnrw: to give the openocd a chance to re-read the new vectors |
| 22:54.09 | drath | johnrw: otherwise your xscale is going to use stale data from the mini i-cache |
| 22:54.34 | drath | johnrw: breaking and resuming at some point after the new vectors have been written, but before the first exception occurs, solves this problem |
| 22:57.05 | johnrw | prpplague: I am in progress already... http://wiki.openwrt.org/OpenWrtDocs/Hardware/USRobotics/USR8200 |
| 22:58.36 | drath | johnrw: ah, and there could be a problem with some of the cache flush functions - at some point (2.5.xxx) the linux kernel used a cache flushing instruction that invalidated the mini-icache that is required for debugging |
| 22:59.39 | johnrw | That project has 3 routers available... 2 that have a working pci, noz's in the uk, and mine that has a really broken pci... So I just bought 2 more today... and hopefully on them... the redboot can setup pci correctly as noz's does... |
| 23:00.15 | johnrw | drath... thank you... oooooh so much for openocd! |
| 23:01.08 | johnrw | drath: now that is an interesting note... so how would I go about finding that instruction? |
| 23:01.52 | drath | johnrw: first make sure you're breaking at the right point for the mini icache to be updated |
| 23:02.25 | drath | johnrw: if you're doing that, and it still doesn't work, let me know, and I'll see if I can dig out some old notes |
| 23:06.37 | johnrw | drath: so I would start out by setting a hw wp on 0xffff0000 length? r/w/a? value? mask? |
| 23:06.38 | johnrw | I would say a length of 0x200 and on any write access... but value and mask I am not too sure about? |
| 23:08.33 | johnrw | am i close? :) value and mask look like they are optional... |
| 23:09.23 | drath | johnrw: it's not that complicated - there used to be a "BDI2000 option" in the linux kernel specifically for this |
| 23:09.33 | drath | johnrw: it was just a software breakpoint within some function |
| 23:09.44 | drath | johnrw: breaking in that function would be enough |
| 23:14.02 | johnrw | how to find that function in this kernel... which can hardly be built from the sources Jungo provides... would be above my paygrade |
| 23:14.20 | johnrw | but I did alot of single stepping |
| 23:14.54 | johnrw | Can I ask why single step doesn't take a numeric parameter? :) |
| 23:15.11 | drath | johnrw: because noone implemented a step <n> ;) |
| 23:15.23 | drath | johnrw: try the watchpoint then |
| 23:15.34 | drath | johnrw: write watchpoint at address 0xffff001c, 4 bytes long |
| 23:15.45 | drath | johnrw: the vector table is 32 bytes long |
| 23:18.09 | johnrw | ok.. I will try that... Let me just say... I really, really, really tried to answer this myself... |
| 23:19.06 | johnrw | but my mentor... well he didn't even want to touch it... |
| 23:19.29 | johnrw | thank you drath! |
| 23:37.41 | johnrw | drath... itworked! |
| 23:39.16 | johnrw | I can even stop this board now! |
| 23:51.11 | drath | johnrw: heh, ok, glad it worked |
| 23:51.50 | johnrw | hmm now asking it to display memory... is giving me a runtime error in commands.c |
| 23:52.38 | johnrw | which is okay... I am a happy guy! |
| 23:53.54 | johnrw | Is this working because I am using a recent version... or would it also have worked in v728...? |
| 23:54.19 | drath | this should have worked since june or july 2007 |
| 23:54.53 | drath | anyway, i'm out, bye and gn8 |
| 23:55.04 | johnrw | ok. g'night |