S3C2440A - SD Card works on Prex!

參考著Samsung的測試程式與u-boot, 把SD driver for prex 移植完畢
目前使用的是處理read/write interrupt的方式完成實做
一開始是採用使用DMA方式實作, 然而碰到無法讀寫完畢
像是read counter會有尚未讀出的資料, 而停留在Rx Active的狀態
今日全部改寫後就可以使用了, 日後會多花時間在blog上撰寫文件與porting過程

日後會實做AC97 driver與 Audio Server
接著就是完成所設定目標的CLI MP3 Player

prex本身有FAT16的支援(之後有打算將fat32移植上去)

以下是開機到把SD Card上名為TEST.TXT的檔案內容印出的過程

Prex Boot Loader V1.00
loading: hdr=01c02008 module=000030e4 name=prex
loading: hdr=01c0a290 module=00003114 name=dev.ko
loading: hdr=01c0e260 module=00003144 name=boot
loading: hdr=01c0fe78 module=00003174 name=proc
loading: hdr=01c12a38 module=000031a4 name=fs
loading: hdr=01c21880 module=000031d4 name=exec
bootdisk base=01c26358 size=000128bc
kernel_entry=00010074
Entering kernel...

Prex version 0.8.1 for arm-at2440ii (Feb 9 2009)
Free pages:
start end size
-------- -------- --------
00000000 - 00010000 64K
00032c00 - 01c26000 28621K
01c39000 - 04000000 36636K
used=140K free=65321K total=65461K
Time slice is 50 msec
IRQ10 attached priority=10
Clock rate: 1000 ticks/sec
Prex driver module built: Feb 9 2009
Calibrating delay loop... ok count=837
Initializing NULL device
Initializing Power Management
pm: Default power policy is performance mode
Initializing Zero device
Initializing Serial Console
UBRDIV0:0x23
MMC check end!!

In SD ready

End id
RCA=0x9ffc
SD Frequency is 33304320Hz

In stand-by

****4bit bus****
SD disk
IRQ21 attached priority=2
Initializing TTY device
Driver initialized
Loading task:'boot'
Loading task:'proc'
Loading task:'fs'
Loading task:'exec'
Starting Bootstrap Server
Starting Process Server
Starting File System Server
Starting Exec Server
boot: Mounting file systems
VFS: Mounting ramfs dev= dir=/
VFS: Mounting devfs dev= dir=/dev
VFS: Mounting arfs dev=/dev/ram0 dir=/boot
VFS: Mounting fifofs dev= dir=/fifo
VFS: Mounting fatfs dev=/dev/card0 dir=/mnt/floppy
boot: Run init process
Prex version 0.8.1 (arm-at2440ii)
[prex:/]# cat /mnt/floppy/TEST.TXT
Hello World !!

[prex:/]#