| # 08:33:43 | smartin | joins #crosstool-ng |
| # 16:11:48 | alan_o | joins #crosstool-ng |
| # 16:15:21 | alan_o | Hi, I'm having a problem with a ct-ng-based system. It's x86 and PC-104, so it should be easy, but I'm stuck. I can build and run the Linux kernel, but any program I try to run as /init fails with general protection. I know that it's a vague description of the problem, but I'm not sure what else is relevant. I'm running ct-ng 1.14.0 and have selected all the packages as the latest (except for the kernel). I'm mostly right now looki |
| # 16:15:21 | alan_o | ng for someone to point me in the right direction as to what I can do to solve this. I've googled for this problem and haven't found much, but I could be just searching for the wrong things. |
| # 16:15:29 | alan_o | anyway, any help is appreciated. |
| # 16:16:05 | alan_o | I'm note even sure ct-ng is the right place to be asking |
| # 16:19:41 | alan_o | Actually, I just tried a re-build of the kernel, and I think I may have it.... |
| # 16:20:14 | alan_o | I rebuilt the kernel (3.1) after changing the kernel version in ct-ng to be an older one than that (3.0.x) |
| # 16:20:27 | alan_o | ok now to build busybox again..... |
| # 17:49:48 | alan_o | looks like it all works now. |
| # 17:50:44 | alan_o | It would appear that when I build the kernel, I have to have CT-NG configured for that kernel version or older, or else programs built with that same CT-NG will not run under the built kernel. |
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| # 19:34:23 | kos_tom | alan_o: can you pastebin your ct-ng .config file ? |
| # 19:44:32 | smartin | quits |
| # 19:50:57 | alan_o | kos_tom: sure |
| # 19:53:27 | alan_o | http://pastebin.com/u4TwrLpU |
| # 19:59:51 | kos_tom | do you pass special flags to gcc when building your userspace side ? |
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| # 21:37:43 | y_morin | alan_o: NPTL will not work for i486. NPTL requires instructions that only came with i686 (maybe i586, but I'm not sure). |
| # 21:37:54 | y_morin | kos_tom: hello! How was FOSDEM? |
| # 21:38:18 | y_morin | alan_o: you will have to use LinuxThreads for anything i486. |
| # 21:39:21 | y_morin | alan_o: As for the kernel version, the running kernel must be supported by the glibc: |
| # 21:39:49 | y_morin | So, either one of these three conditions is enough: |
| # 21:39:57 | y_morin | 1) the same kernel headers are used |
| # 21:40:09 | y_morin | 2) a more recent kernel is running |
| # 21:40:25 | y_morin | 2b) or an older kernel is used to build the toolchain |
| # 21:40:37 | y_morin | 3) the glibc is ocnfigured with back-ward compatibility shims |
| # 21:47:32 | kos_tom | y_morin: hello! FOSDEM was too short, as usual. |
| # 21:47:46 | kos_tom | and the way back to Toulouse was a bit complicated by the snow in Toulouse. |
| # 21:48:00 | y_morin | kos_tom: too short, I can understand! ;-) |
| # 21:48:03 | kos_tom | our flight on Sunday evening was canceled, we had to wait Monday morning... but we had 10 customers waiting in Toulouse for a training session... |
| # 21:48:44 | y_morin | Ooopss.. Hopefully, they understood you were doing some kind of "technology survey", hence your beinf late! ;-) |
| # 21:48:53 | y_morin | *being |
| # 21:50:19 | y_morin | kos_tom: I ca never properly remember the requirements for NPTL. Was the minimum CPU supported i486, i586, or i686? |
| # 21:50:29 | y_morin | *can never... |
| # 21:54:03 | kos_tom | I also never remember. |
| # 21:54:27 | y_morin | Sigh... The only docs I could find wrt NPTL design are dated back to 2003-2005... |
| # 21:54:37 | kos_tom | I think it uses cmpxchg |
| # 21:54:42 | kos_tom | so I would be tempted to say i486 |
| # 21:54:44 | kos_tom | but I'm unsure. |
| # 21:54:53 | y_morin | kos_tom: Ah, yes, that's the instruction! Thanks! |
| # 21:55:22 | kos_tom | http://sourceware.org/bugzilla/show_bug.cgi?id=849#c4 |
| # 21:55:32 | kos_tom | seems to confirm that >= i486 is the requirement for nptl |
| # 21:56:32 | y_morin | kos_tom: Thanks! It would indeed yield a toolchain compile error, not a runtime error. |
| # 21:57:44 | y_morin | kos_tom: further assesed by the first sentence there: https://en.wikipedia.org/wiki/Intel_486#Improvements |
| # 21:59:18 | y_morin | remembers that time, when a *fast* CPU would run at a mere 33MHz clock... Sigh, he's getting old... :-] |
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| # 23:57:17 | y_morin | quits : Quit: Night! (yes, for real, this time! ;-) |