Readme-ja.txt を参考に miniSD を mount してみました。
内蔵キーボードで長いデバイス名を打つのは大変なので省略しています。

$ mknod /dev/sd b 254 1
$ mkdir /mnt/sd
$ mount /dev/sd /mnt/sd
$ df

Filesystem Size Used Available Use% Mounted on
/dev/sd 1.9G 256.0k 1.9G 0% /mnt/sd

SD にリダイレクトして書き込み → umount → PCで読み出し
等も普通にできました。

$ dmesg

Linux version 2.6.21.5 (z3@vmsv.local) (gcc version 4.2.0) #95 Fri Jun 29 23:36:11 JST 2007
CPU: XScale-PXA270 [69054117] revision 7 (ARMv5TE), cr=0000397f
Machine: Sharp W-ZERO3[es] WS007SH
Memory policy: ECC disabled, Data cache writeback
On node 0 totalpages: 16384
DMA zone: 128 pages used for memmap
DMA zone: 0 pages reserved
DMA zone: 16256 pages, LIFO batch:3
Normal zone: 0 pages used for memmap
Run Mode clock: 208.00MHz (*16)
Turbo Mode clock: 416.00MHz (*2.0, active)
Memory clock: 208.00MHz (/2)
System bus clock: 208.00MHz
CPU0: D VIVT undefined 5 cache
CPU0: I cache: 32768 bytes, associativity 32, 32 byte lines, 32 sets
CPU0: D cache: 32768 bytes, associativity 32, 32 byte lines, 32 sets
Built 1 zonelists. Total pages: 16256
Kernel command line: mem=64M
PID hash table entries: 256 (order: 8, 1024 bytes)
Console: colour dummy device 80x30
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory: 64MB = 64MB total
Memory: 54272KB available (1876K code, 226K data, 8516K init)
Calibrating delay loop... 415.33 BogoMIPS (lpj=2076672)
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
NET: Registered protocol family 16
Time: pxa_timer clocksource has been installed.
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 2048 (order: 2, 16384 bytes)
TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
TCP: Hash tables configured (established 2048 bind 2048)
TCP reno registered
NetWinder Floating Point Emulator V0.97 (double precision)
io scheduler noop registered (default)
Console: switching to colour frame buffer device 60x40
pxa2xx-uart.0: ttyS0 at MMIO 0x40100000 (irq = 22) is a FFUART
pxa2xx-uart.1: ttyS1 at MMIO 0x40200000 (irq = 21) is a BTUART
pxa2xx-uart.2: ttyS2 at MMIO 0x40700000 (irq = 20) is a STUART
loop: loaded (max 8 devices)
PPP generic driver version 2.4.2
mice: PS/2 mouse device common for all mice
input: Sha_pon Keyboard as /class/input/input0
IPv4 over IPv4 tunneling driver
TCP cubic registered
NET: Registered protocol family 17
XScale iWMMXt coprocessor detected.
Freeing init memory: 8516K
mmcblk0: mmc0:e624 SU02G 1985024KiB
mmcblk0: p1


$ cat /proc/cpuinfo

Processor : XScale-PXA270 rev 7 (v5l)
BogoMIPS : 415.33
Features : swp half thumb fastmult edsp iwmmxt
CPU implementer : 0x69
CPU architecture: 5TE
CPU variant : 0x0
CPU part : 0x411
CPU revision : 7
Cache type : undefined 5
Cache clean : undefined 5
Cache lockdown : undefined 5
Cache format : Harvard
I size : 32768
I assoc : 32
I line length : 32
I sets : 32
D size : 32768
D assoc : 32
D line length : 32
D sets : 32

Hardware : Sharp W-ZERO3[es] WS007SH
Revision : 0000
Serial : 0000000000000000