???? ??? - (11) Ramdisk, NFS

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???? ???- (11) Ramdisk, NFS

Konkuk Univ. VLSI Design Lab.
Konkuk Univ. Dept. of Electronics
2

File System Application

• ????? ( FileSystem ) ???
• ???? ??? ?? ??? ??? ?? ????? ???? ???, ??(Block)
  ??? ?? ?? ????? ???.
• ?????? ??

Konkuk Univ. Dept. of Electronics
3
FileSystem ??

/ ?? ???? /boot ?? ??? ??? ?? ?? ???? ????
?? /bin ?? ??? ?? ?? ls, cp, mv, rm, mount,
mkdir, vi ?? /sbin ??? ??? ?? ?? ???? ??
ifconfig, halt, shutdown, mkfs, fsck ?? /dev
???? ????? ???? ?? ???? ?????? ?? /dev/cdrom,
/dev/hda0, /dev/null ?? /etc ??? ??? ??? ?? ??
? ??? ???? ?? ?? /etc/passwd ??? ??? ????
?? /etc/fstab mount a???? ????? ?????? ??
?? /etc/profile ?? ?? ??? ? ? ???? ??
/home ???? ? ???? /lib ?? ????? ?? ?? /root
??? ???? root? ? ???? /usr ?? ??? ???? ???? ??
/usr/local 3rd party ???? /usr/src ???
?? ?? /var ??? ?? ? ?? ?? /var/mail
e-mail ?? /var/log ??? ?? ?? /var/run
?? ?? ????? PID /tmp ?? ?? ????
Konkuk Univ. Dept. of Electronics
4
About Ramdisk

• Ramdisk??
• ??? ??? ???? ?? ???? ? ??? ???? ???? ?? ????? ??
  ????? ? ???.
• Ramdisk? ??
• ?? ??? ????.
• ??? ???? ?? ???? ??? ?? ??.
• ?? ??(gzip)? ????? ??? ????? ??? ? ??.

Konkuk Univ. Dept. of Electronics
5
Ramdisk ??? ???(Mount)

dd if /dev/zero of./ramdisk_img bs1k
count8192 mkfs t ext2 ramdisk_img
?????? 1K(1024)? ??.
16384? ???? ????
dd? ??? ????? ramdisk_img? 0?? ???
??? ? ???? ext2 ??????? ???.
mount t ext2 o loop ramdisk_img
/mnt/ramdisk -- ?? ?? ?? ? -- umount
/mnt/ramdisk gzip ramdisk_img
Konkuk Univ. Dept. of Electronics
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Ramdisk ??

• Ramdisk ??
• - CD ? ???? Ramdisk ???? ???.
• ?? ???? ???

Konkuk Univ. Dept. of Electronics
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Ramdisk ??

• Ramdisk ????
• Ramdisk ?? ??

Konkuk Univ. Dept. of Electronics
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Ramdisk ??

• Ramdisk ? mount ? ???? ??
• ?? ???? Ramdisk ????

Konkuk Univ. Dept. of Electronics
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Ramdisk ??

• Ramdisk Mount
• Ramdisk Mount ????

Konkuk Univ. Dept. of Electronics
10
Ramdisk ??

• Ramdisk Mount
• - root_at_localhost ramdisk mount o loop
  ramdisk ./tmp
• tmp ????? ???? ????
• - root_at_localhost ramdisk cd tmp

Konkuk Univ. Dept. of Electronics
11
Ramdisk ??

• ???? ??
• ??? ??? ??
• ???? ??
• file ???? ???? ??? ??? ????.

Konkuk Univ. Dept. of Electronics
12
Ramdisk ??

• Cross Compiler ???

• ???? ??
• hello.c
• ??? ??? ??
• ?? gcc ??? ??? ???? ???
• ?? ARM??? ??? ?? ??.
• ???? ??
• ?? ??? ?????? ????.
• ???? ????.
• file ???? ???? ??? ???
• ????.

Konkuk Univ. Dept. of Electronics
13
Ramdisk ??

• ARM Compile
• - Cross Compiler ? ???? Target board ??
  ???? ???
• hello.c file ? compile ??.
• root_at_localhost ramdisk arm-linux-gcc
  -o hello-arm hello.c

Konkuk Univ. Dept. of Electronics
14
Ramdisk ??

• Add File
• - Compile ??? file ??

Konkuk Univ. Dept. of Electronics
15
Ramdisk ??

• Unmount Ramdisk
• - ??? ??? Ramdisk ? ??
• root_at_localhost ramdisk umount ./tmp
• Unmount ?? ( df ??? ?? )

??) ???? unmount ? ??? umount ??.
Konkuk Univ. Dept. of Electronics
16
Ramdisk ??

• gzip ?? ????
• tftp ??? ??? ??

Konkuk Univ. Dept. of Electronics
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Ramdisk Download

• Ramdisk Download ( minicom ? ???? )

minicom
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Ramdisk Download

• Minicom ? ???? ????

minicom
Konkuk Univ. Dept. of Electronics
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NFS ????

• IP Address ??
• - ifconfig ??? ???? IP? ????.

minicom
Konkuk Univ. Dept. of Electronics
20

NFS ????

• Server ? Target Board ? IP ??? ????.
• - root_at_linux / ifconfig eth0
  192.168.1.10 up

minicom
Konkuk Univ. Dept. of Electronics
21

NFS ????

• NFS ? ??? ????
• - root_at_linux / mount -t nfs -o nolock
  192.168.1.1/nfs /mnt/nfs
• NFS ?? ??? ??? hello-arm file ??

minicom
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NFS ????

• NFS ? ??? ????
• - File ?? ? Target Board ?? Server ? File
  ? ???? ??.
• root_at_linux nfs ./hello-arm

minicom
Konkuk Univ. Dept. of Electronics