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| 20:25.07 | juiceme | ping thedead1440 |
| 20:25.12 | juiceme | ping Timo |
| 20:25.25 | juiceme | I've been away for some time... |
| 20:27.09 | juiceme | Did you get resolution on the non-detected partition on the USB, or did you already flash the unit? |
| 20:28.59 | juiceme | What Jonni says about disks not getting detected, sounds pretty strange 'cos USB should be pretty universal, it should not depend on the HW of the USB or OS, really. |
| 20:29.58 | juiceme | For the record I use pretty much exclusively Lenovo laptops, OS is currently Ubuntu 12.4 but 10.4 has always worked for me also... |
| 20:30.05 | Jonni | well usb has always worked for my machine, but in forums there has been many machines where it doesnt detect rescue mode usb devices |
| 20:31.05 | Jonni | usually because of wierd linux distro or different set of kernel drivers |
| 20:31.21 | juiceme | Could be cables too, I have one a bit cheaper cable that works OK for charging but breaks all the time when used with data. Dangerous for flashing :( |
| 20:33.27 | juiceme | Hey, Jonni, I got an idea today... I would like to have a test unit that I hack with serial cable for boot time mgs output, and I don't want to ruin my main device with drilling holes in the chassis and soldering wires thru.. |
| 20:33.38 | juiceme | But I thought of USB then |
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| 20:34.07 | juiceme | Do you think it is fasible to do early init of the USB to act as dummy output device |
| 20:34.08 | Jonni | well you dont have to drill anywhere, just to remove sim card slot. |
| 20:34.29 | Jonni | as rx tx pins can be accessed through that |
| 20:34.33 | juiceme | well yes, O could feed the wires thru the slot |
| 20:35.03 | juiceme | but still, it is not elegant using that as your everyday phone |
| 20:35.29 | Jonni | well you were speaking about test unit :) |
| 20:36.38 | juiceme | but it should be possible to create an ip/usb connection that would just send the messages to a hard pre-defined destination, and then I could just launch a receiving console on my PC to display the messages... |
| 20:37.42 | juiceme | If I can buy a cheapo secondhand/broken unit then I would have this dedicated test device. No problem drilling holes there. |
| 20:37.47 | Jonni | sure it is, but if you want full serial log, you need the physical connection |
| 20:37.56 | juiceme | If I need to use my main device, it is no-no |
| 20:38.24 | juiceme | Well partial log is better than nothing :) |
| 20:38.41 | juiceme | If I can init the usb console early enough, it's okay |
| 20:39.05 | juiceme | Do you know if anybody has tried that before? |
| 20:58.59 | Jonni | well earlier versions of harmattan included /dev/ttyUSB0 but that kernel module was removed at some point. |
| 20:59.30 | juiceme | why might that have been done? |
| 20:59.39 | Jonni | security reasons |
| 20:59.47 | juiceme | okay |
| 21:00.18 | juiceme | Well do you think it is difficult to reimplement, does it touch the HW deeply? |
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| 21:04.02 | Jonni | just a kernel driver, so not that difficult, but requires exploited capas |
| 21:07.26 | juiceme | That's no problem as I need it for boot time debugging, which practically means I am anyway running in open mode and booting a custom kernel. I propably will just try glueing the code as early on the boot pahse as possible. |
| 21:22.17 | juiceme | The usb is twl4030, right? |
| 21:42.40 | Jonni | juiceme: oh and you are aware that you can look previous bootlogs from /dev/mtd3 even without any big tricks? :) |
| 21:43.19 | Jonni | just by running strings /dev/mtd3 :) |
| 21:45.03 | juiceme | oh? |
| 21:45.11 | juiceme | I did not know that |
| 21:45.56 | juiceme | aah, it's this one: mtd3: 00200000 00040000 "log" |
| 21:46.20 | juiceme | So kernel logs stuff there on nand? |
| 21:46.25 | Jonni | yep |
| 21:46.44 | juiceme | fairly cool thing... what's the format? |
| 21:46.51 | Jonni | so if you dont need realtime logging, that should be enough |
| 21:47.10 | Jonni | well there is a propriotary format, but if you just run strings command on that you get it cleartext |
| 21:47.15 | juiceme | well for quite a few things it might be :) |
| 21:48.48 | juiceme | for example; I had problem in chainloading I was trying to debug last week, when I start the Harmattan kernel via kexec() from Nemo kernel, it does not always start correctly |
| 21:49.34 | juiceme | It will either hang before the boot video starts or it will start correctly, depending on how I do the kexec() |
| 21:50.41 | juiceme | How does it store the boot log, does it always start from start or is there a ring buffer or something? |
| 21:50.51 | Jonni | well thats just security feature most likely, since harmattan kernel was protected against kexec attacks if I remember right. |
| 21:51.13 | juiceme | Is it always the previous boot or can it be a mix-up from several boots? |
| 21:51.39 | juiceme | Yes, it took me while to boot at all :) |
| 21:51.42 | Jonni | it has multiple boots, around 10 last boots in sequence if I remember right |
| 21:52.09 | Jonni | so ring buffer kind of thingie, but not exactly |
| 21:53.38 | juiceme | well I will have to try by saving it as text, doing my boot test and comparing to the saved version |
| 21:53.40 | Jonni | hardware serial cable is the best option though, ofcourse it means that you need to sacrifice extra hardware |
| 21:53.47 | juiceme | yes |
| 21:57.04 | juiceme | hmm just thought about it, is there any side-effects if I wipe mtd3 before boot? |
| 21:57.28 | juiceme | So is it just log or does it store anything important? |
| 21:57.31 | Jonni | that I dont know, I have never wiped it |
| 21:58.27 | Jonni | afaik its just for logging |
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| 22:40.25 | juiceme | Hi Jonni ya still there? |
| 22:41.13 | juiceme | Is it so that only failed boots are logged to mtd4? |
| 22:42.19 | juiceme | I was looking around a bit and noticed that the dmesg of the current boot I am running now can not be found from there...? |
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| 23:53.42 | Jonni | mtd3 |
| 23:53.47 | Jonni | mtd4 is unused |