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| 18:47.38 | kazaLite | hi all ... last week i had a job interview... apart from evaluating my resume, i was asked 15 questions |
| 18:48.32 | kazaLite | from 15 questions, i answered 2 questions in a very poor way, 1 question was answered partially correct. |
| 18:49.22 | kazaLite | 2 questions can be though of out of scope. Like i was asked what is SPI? i said... you mean realted to hardware..spi bus....he said yes... i said i never worked with it |
| 18:49.56 | kazaLite | similarly i was asked whats nor/nand... i again said its memory? interviewer said yes... flash memory... i said i never worked with it |
| 18:50.14 | kazaLite | remaining 10 were answered correctly. |
| 18:50.37 | kazaLite | how do you guys think about this interview? was is average? bad? good? |
| 18:51.00 | kazaLite | any experienced/senior embedded guy who has been taking interviews? |
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| 20:36.20 | pat123 | hi |
| 20:37.02 | florian | hi pat123 |
| 20:38.19 | pat123 | i have some beginner questions |
| 20:38.46 | pat123 | and was wondering if i can get some help |
| 20:42.05 | florian | just try |
| 20:44.37 | pat123 | I'm having problems trying to include the gpio header file in my code |
| 20:46.08 | pat123 | i'm using #include <mach/regs-gpio.h> |
| 20:46.50 | HcE | sounds very wrong |
| 20:47.03 | HcE | machine dependant include in a driver? |
| 20:47.51 | pat123 | ? |
| 20:49.12 | HcE | is this a kernel driver or something similar? |
| 20:49.26 | pat123 | yes...I'm using buidroot |
| 20:51.20 | HcE | mach = machine |
| 20:51.29 | HcE | so machine dependant code in a driver is usually a bad idea |
| 20:51.41 | HcE | sounds like you want to do GPIO, tried using gpio-sysfs? |
| 20:53.13 | pat123 | do I #include <gpio-sysfs.h> |
| 20:54.27 | HcE | you need to add the GPIO stuff in drivers -> gpio section of the kernel config |
| 20:54.36 | HcE | do make ARCH=your_arch menuconfig |
| 20:55.01 | HcE | and see what pops up in drivers-> gpio |
| 20:55.43 | pat123 | how do i add the GPIO stuff in drivers |
| 20:56.42 | florian | use gpio.h and the gpiolib functions |
| 20:58.11 | pat123 | In the buildroot directory I see a Config.in. Is that where I add the GPIO stuff |
| 21:00.24 | HcE | Buildroot has nothing to do with your Linux kernel |
| 21:00.51 | HcE | I would download the latest stable kernel from kernel.org and start hacking on that |
| 21:02.14 | pat123 | I'm in the menuconfig but dont see drivers |
| 21:03.50 | HcE | are you still working in Buildroot? Or did you download the kernel sources and move to that? |
| 21:04.16 | pat123 | I just got the kernel source |
| 21:04.35 | HcE | what ARCH are you on? |
| 21:05.02 | pat123 | my eval is arm9 s3c2410A |
| 21:05.11 | HcE | should be visible then |
| 21:05.13 | HcE | kernel version? |
| 21:05.27 | pat123 | I'm on my laptop |
| 21:05.37 | pat123 | kernel version 2.6.22 |
| 21:05.52 | HcE | gpiolib did not exist then, download the latest kernel |
| 21:06.03 | HcE | 2.6.29.4 |
| 21:06.12 | pat123 | ok |
| 21:07.04 | pat123 | it's downloading |
| 21:07.54 | HcE | http://www.avrfreaks.net/wiki/index.php/Documentation:Linux/GPIO <-- this site describes your choice quite well, skip to gpio-sysfs |
| 21:11.55 | pat123 | done downloading |
| 21:12.37 | pat123 | it won't let me make menuconfig |
| 21:19.01 | HcE | make ARCH=arm menuconfig |
| 21:19.17 | HcE | you need make and ncurses development package on your Linux system |
| 21:20.47 | pat123 | install ncurses |
| 21:21.39 | pat123 | i get this message when installing ncurse: Package ncurses is not available, but is referred to by another package. |
| 21:21.39 | pat123 | This may mean that the package is missing, has been obsoleted, or |
| 21:21.39 | pat123 | is only available from another source |
| 21:21.39 | pat123 | E: Package ncurses has no installation candidate |
| 21:22.11 | HcE | what distro are you running? |
| 21:22.38 | pat123 | ubuntu 8. |
| 21:22.45 | HcE | install ncurses5-dev |
| 21:23.50 | pat123 | <PROTECTED> |
| 21:23.55 | pat123 | pat@pat-laptop:~/linux-2.6.29.4$ sudo apt-get install ncurses5-dev |
| 21:23.55 | pat123 | Reading package lists... Done |
| 21:23.55 | pat123 | Building dependency tree |
| 21:23.55 | pat123 | Reading state information... Done |
| 21:23.55 | pat123 | E: Couldn't find package ncurses5-dev |
| 21:24.07 | HcE | search for it, probably jst some naming |
| 21:24.15 | pat123 | ok |
| 21:24.17 | HcE | Ubuntu v8.something is old |
| 21:24.38 | HcE | it is probably libncurses5-dev |
| 21:25.46 | pat123 | it installed |
| 21:27.30 | pat123 | when I make ARCH=arm menuconfig I get : |
| 21:27.55 | pat123 | pat@pat-laptop:~/linux-2.6.29.4$ make ARCH=arm menuconfig |
| 21:27.55 | pat123 | Makefile:308: /home/pat/linux-2.6.29.4/scripts/Kbuild.include: No such file or directory |
| 21:27.55 | pat123 | make: *** empty variable name. Stop. |
| 21:27.55 | pat123 | make: *** [scripts_basic] Error 2 |
| 21:34.27 | pat123 | i dont see the script dir in linux-2.6.29.4 |
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| 22:18.29 | pat123 | I'm got make ARCH=arm menuconfig to work |
| 22:19.59 | pat123 | under device drivers I dont see gpio |
| 22:27.31 | florian | for some devices its selected implicitly iirc |
| 22:28.06 | florian | grep GPIO .config might give some clue |
| 22:28.40 | pat123 | so just exit and make? |
| 22:32.36 | florian | pat123: yes |
| 22:34.28 | pat123 | is grep GPIO .config in the linux-2.6.29.4 dir |
| 22:35.30 | florian | yes |
| 22:42.39 | pat123 | in the .config it says gpio is not set |
| 22:42.55 | pat123 | or should i wait till make finish |
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| 22:54.25 | pat123 | how does linux-2.6.29.4 work with my exiting buildroot |
| 22:55.23 | florian | just try |
| 22:55.59 | pat123 | its still making |
| 22:57.58 | pat123 | what do i do after make finishes |
| 22:58.29 | florian | depends on your board / bootloader |
| 22:59.06 | pat123 | I may be using U-boot |
| 22:59.28 | pat123 | and my board is the arm s3c2410A |
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| 22:59.55 | pat123 | make is done |
| 23:00.41 | florian | doesn't really know about this. u-boot offers a lot of options such as tftp and mmc/sd |
| 23:01.54 | pat123 | i got some errors |
| 23:02.34 | pat123 | drivers/scsi/advansys.c: In function 'advansys_get_sense_buffer_dma': |
| 23:02.34 | pat123 | drivers/scsi/advansys.c:9885: error: implicit declaration of function 'dma_cache_sync' |
| 23:02.34 | pat123 | make[2]: *** [drivers/scsi/advansys.o] Error 1 |
| 23:02.34 | pat123 | make[1]: *** [drivers/scsi] Error 2 |
| 23:02.34 | pat123 | make: *** [drivers] Error 2 |
| 23:03.12 | florian | pat123: do you have scsi? |
| 23:03.27 | pat123 | no |
| 23:04.09 | florian | pat123: then turn it off with menuconfig |
| 23:07.23 | pat123 | I see GPIO Support in menuconfig |
| 23:07.35 | pat123 | enable that? |
| 23:07.57 | florian | yes |
| 23:08.24 | pat123 | theres a option: /sys/class/gpio/...(sysfs interface) (new) |
| 23:08.33 | pat123 | should i enable it? |
| 23:08.52 | florian | yes |
| 23:09.30 | pat123 | in Bus support I don't see scsi |
| 23:09.45 | florian | its in devices |
| 23:10.36 | pat123 | i see scsi device support |
| 23:11.20 | pat123 | theres a whole menu of scsi disable all of the options |
| 23:12.03 | florian | just disable scsi support in general |
| 23:12.57 | pat123 | it doesn't let me. |
| 23:13.34 | pat123 | it doesn't have a braket before SCSI device support |
| 23:14.53 | florian | you want disable scsi device support |
| 23:16.43 | florian | needs some sleep... good night |
| 23:16.46 | pat123 | it only let me put a * or a M in the bracket next to SCSI device support |
| 23:18.46 | pat123 | when i press 'N' nothing happens |
| 23:19.20 | pat123 | thanks |
| 23:20.08 | pat123 | goodnite |
| 23:25.18 | Mirell | Hmm... |