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?
" z6 ^0 g: o/ ~; E; Z! T
+ ?; G5 d5 a( b. @9 ?$ I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.
有人能再補充更多的嗎?

Driver Overview: Linux kernels have two ATA ("IDE") driver sets:
! n; R: y0 N6 E. Q5 L$ w/ q. A
"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.

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):
6 v; ?' {9 H# R4 |
* H; C5 |0 ~/ T2 dFor 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.
" I1 K( X* P' z; p- w( h
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/
( v7 c2 p. S- S$ h0 E! ^# ?
1 s6 g% w  J+ m5 x" p! B' [I'm pretty sure manufacturers' proprietary drivers, where available, are designed to fit the above framework.

"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.
/ L  T/ \* m' e' m6 o# h+ V
/ J- M9 w. r6 a' f9 t0 w5 Nlibata 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
* T/ `6 \* c2 E6 y2 P) A& x" Owww.t13.org ATAPI

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...
4 `" Z: M+ n7 S" ^% g) t
不過還是謝了
. b) U$ o7 M# P3 M+ Y; w8 M. b: i
* P0 c& P  [- m: a$ E/ g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。

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。
: t) k% l& d4 F% d' G
+ d: o; D6 S" t: Z0 e, |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
; ?7 z( r9 C' ^: eLinux的源碼就有很可供參考,不管是legacy IDE或是掛在SCSI下的libata
( E0 v( k6 J2 \9 q& f, g( D8 P看個2~3隻driver,你就會清楚ATA的interface需要哪些structure及private function point.
9 z' \2 L* }9 n# v. N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
& L& P4 _' L8 f! {& Y) t6 Y& u- tLinux的源碼就有很可供參考,不管是legacy IDE或是掛在SCSI下的libata
, d" B+ l4 b- M; W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。