proting IDE driver for uclinux/linux

tommywgt

我在Xilinx FPGA(EDK8.2)引用了MicroBlaze 32 bits RISC CPU, 可以RUN uclinux, 現在我又設計了一個非標準的IDE, 我自己寫個程式去R/W HD, 400G的也沒問題, 我也寫了一個FAT32 file system透過FAT32的LIB我所做的檔案操作, 使得HD接到WINDOWS也可以RUN的很正常. 但是問題來了, 這些自己寫的HD LIB無法跟uclinux KERNEL結合, 以致於無法直接跟系統資源結合, 也無法在VFS內mount這個device?

  }2 z9 [$ p4 ]' X) G有人能夠清楚的詳列在LINUX下porting IDE driver的步驟嗎?

tommywgt

這一段是說明如何用ata driver改成sata, 照道理來講就是改drivers/ide這一段的code就對了.
% p8 X9 T" T# u9 L有人能再補充更多的嗎?
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Driver Overview: Linux kernels have two ATA ("IDE") driver sets:
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& h  ~* ~! S: T: k) l+ `0 v! g7 y& g"drivers/ide": This is the traditional ATA driver set, maintained by Bartlomiej Zolnierkiewicz (before that, Andre Hedrick). Contrary to popular belief, it includes low-level drivers for many common SATA chipsets.
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1 b0 \/ d7 }9 Q( c* J  @Optionally, on top of drivers/ide block-device (generic mass storage access) drivers, one can load drivers to provide software-level suport for BIOS services enabling various types of manufacturer-specific software RAID (called "fakeraid", below):
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For 2.4 kernels, Linux's software-RAID (fakeraid) driver collection is called "ataraid", which has subdrivers for the various manufacturers' different software RAID schemes. Using ataraid results in your partitions being addressed using a /dev/ataraid/d0p1 (etc.) device-naming convention. Note: Support greatly improved circa-2.4.23.
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For 2.6 kernels, Linux's software-RAID (fakeraid) driver collection is called "dmraid" (Device Mapper RAID). So far (Sept 2004), Promise Fasttrack, HighPoint 37X, Intel ICH5/6, LSI, and SiI 3112A/Medley are supported: http://tienstra4.flatnet.tudelft.nl/~gerte/gen2dmraid/
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I'm pretty sure manufacturers' proprietary drivers, where available, are designed to fit the above framework.

) k, v7 }4 N* H3 ]8 T& W4 H"libata": This is the newer ATA driver set for selected SATA chipsets only, maintained by Jeff Garzik, leveraging the kernel's well-tested SCSI layer. Garzik developed it in the 2.6 kernel series. 2.4 support was available only with a backported patch until libata's inclusion in 2.4.27 and later.

4 v2 q0 ~4 F" S0 V2 Llibata causes each SATA port appear as a new SCSI bus. There are individual low-level drivers for the individual SATA chipsets, e.g., ahci, ata_adma, ata_piix, sata_nv, sata_promise, sata_sil, sata_sx4, sata_svw, sata_via, sata_vsc.

tommywgt

另外這有二個很重要的網站
www.t10.org SCSI
% z; P( y1 `7 u' ?2 S! u- Lwww.t13.org ATAPI
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我在design HD controller時就是根據這二個網站資料的

kevin

我想你的問題是如何寫 Uclinux ide/ATA 的 driver.
可以參考O'Reilly "Linux Device Drivers" book.
code example 在 http://examples.oreilly.com/linuxdrive3/

tommywgt

好巧...這本書我有也...
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+ _& b, w2 W7 e+ f" P不過還是謝了
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6 f3 }, R6 E1 d大大願意在這跟大家分享的話論壇的後進都會感謝你的...

tommywgt

沒人回也...我自己推一下好了, 不然只好找時間自己回了...鳴

windflowerz

我隻能幫妳頂一下，非常抱歉，幫不暸忙哦

jacky002

因為你是用uCLinux，所以我首先會問你有沒有將MMU的設定關掉，在我記憶中uCLinux是不支援MMU的。
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其次，你是用ATAPI或是SCSI的driver layer去寫這個driver的。建議Driver path最好還是使用SCSI會比較好，其實底層都類似，只不過SCSI再上層多做了一層，轉了一層SCSI command，也補強之前ATAPI的部分不足。

給你參考，希望對你有所幫助。

olduncle

除了看書之外,最實際的方法就是參考别家的Source code
Linux的源碼就有很可供參考,不管是legacy IDE或是掛在SCSI下的libata
看個2~3隻driver,你就會清楚ATA的interface需要哪些structure及private function point.
( y2 ^! O3 ?* B  F而且Lnux本身就支援許多Filesystem,除非你是要hack filesystem,否則只要porting driver就夠了。

olduncle

除了看書之外,最實際的方法就是參考别家的Source code
: ]: o" h# ^( V0 K( j) ~: vLinux的源碼就有很可供參考,不管是legacy IDE或是掛在SCSI下的libata
看個2~3隻driver,你就會清楚ATA的interface需要哪些structure及private function point.
而且Lnux本身就支援許多Filesystem,除非你是要hack filesystem,否則只要porting driver就夠了。