A Episode from #gentoo-embedded #2

面白いので，こう言う感じで続けて行こうかな？
ネタには困らんし． :P
[It's a interested to me like a that.
I have too many issues related its stuff. :P]

今日はHali_303さんから，
コンパクトフラッシュ関連の話題になった．
[Today,
I have talked with Hali_303 about CompactFlash related issues.]

11/29 00:31:54 *
    Hali_303 (n=surfk@sclauto.scl.sztaki.hu) has joined #gentoo-embedded
11/29 00:32:00 Hali_303
    hi
11/29 00:32:13 Hali_303
    anyone used a compact flash as a boot medium?
11/29 00:32:50 Hali_303
    when I have a compact flash in my system, during bootup the kernel halts for a
    few seconds and prints dma_timer_expiry

と言う訳で，DMA の問題が起きていた様です．
こう言う場合は，
　Kernel 側の自動認識に誤りが有るか，
　ドライバに問題が有るか，
　ハードウェアに問題があるか，
と言う所が疑えるでしょう．
[So, he has DMA's issues.
In this case, it cause that
　Kernel's some auto detection feature failed,
　The driver is not completely implementation,
　Just a got bad hardware....
these are in a major oder in my mind.]

11/29 00:34:42 hiyuh
    Hali_303, isnt it a your target's kernel or drivers implementation issues?
11/29 00:38:33 hiyuh
    Hali_303, or you *just* got bad compact flash. i know the driver works fine one,
    but the driver work *not* fine another one.
11/29 00:43:33 Hali_303
    hiyuh: what driver do you mean?
11/29 00:43:51 Hali_303
    I have a geode GX1 target (i586 MMX compatible)
11/29 00:44:05 Hali_303
    and the CF card can be accessed as a regular IDE drive
11/29 00:44:13 Hali_303
    (the bios also sees it)
11/29 00:48:22 hiyuh
    i mean "the driver is you selected (it might be found in kernel menu
    configuration), then your target use for your cf"
11/29 00:51:23 hiyuh
    storage device's driver and/or enabled dma has implementation issues sometimes,
    i know
11/29 00:52:42 hiyuh
    it coz driver's bug and/or to got bad device
11/29 00:53:38 hiyuh
    so, havent you tried to disable dma?

と言う訳で，
この問題を回避する為に取り敢えずDMAを無効にしてみる事を提案．
[Then,
I gave him some suggestions for to work around this issue to disable the DMA.]

11/29 01:07:13 Hali_303
    hiyuh: according to hdparm, DMA is disabled
11/29 01:08:19 hiyuh
    Hali_303: hum, its a *just* new release hardware?
11/29 01:10:29 *
    hiyuh has little knowledge about geode
11/29 01:13:33 hiyuh
    Hali_303: some new released hardwares have a bit of driver's issues.
    sorry, its just one of generally knowledge. :(
11/29 01:15:30 Hali_303
    hiyuh: it's a pretty old advantech geode board
11/29 01:16:31 hiyuh
    Hali_303: can i get its spec?
11/29 01:18:45 Hali_303
    http://www.advantech.com.tw/products/Model_Detail.asp?model_id=1-TQMK6&BU=ACG&PD=
11/29 01:29:25 hiyuh
    Hali_303: i just got its spec. :)
11/29 01:29:29 *
    hiyuh is reading the pdf.
11/29 01:31:40 hiyuh
    Hali_303: the board has Ultra DMA33 interface. its a cf interface, right?
11/29 01:35:22 hiyuh
    Hali_303: umm, your kernel or driver has "dma auto detect is default" feature
    or so? isnt it might be failed?

で，解決しました． :)
[Mm'kay, he got a solution. :)]

11/29 02:20:06 Hali_303
    hiyuh: I've got the solution
11/29 02:20:40 Hali_303
    hiyuh: I had to do two things: in the kernel setup, I've enabled "multi mode by
    default" and to the kernel command line, I've added hda=none hdb=none
11/29 02:20:47 Hali_303
    (since the flash is hdc)
11/29 02:22:16 hiyuh
    Hali_303: ah-ha, wilco.
11/29 02:23:11 hiyuh
    Hali_303: have fun your embedded stuff! :)
11/29 02:24:24 Hali_303
    hiyuh: thx! I've also disabled DMA to be sure, but I guess I can re-enable it,
    since the previous two solved it
11/29 02:35:51 hiyuh
    Hali_303: no problem, but im hungry. :P
11/29 02:35:55 *
    hiyuh will go to get something to eat.

この後，
セブンイレブンでラーメンとおにぎりを買ってきて，
それを喰いながらこれ書いてました． :)
[After the event,
I bought a noodle and a rice ball at 7-11.
Then, I came back and post it now. :)]