Using rz and sx Commands — Downloading Files to Target Board via Serial Terminal

The newly downloaded Linux source code does not include the super terminal commands by default and must be added manually. After adding them, the development board can transfer files from a PC through a serial port.

Steps:

Download the software rzsz-3.48.tar.gz from http://freeware.sgi.com/source/rzsz/rzsz-3.48.tar.gz.
Extract: tar zxvf rzsz-3.48.tar.gz
Install:
cd src
vi Makefile
Modify CC=arm-linux-gcc
Save and exit
Run make posix

Note: This software installation differs from standard GNU software — there is no configure step or make install process.
I'm using an S3C2410 cross-compiler; for different platforms, only the cross-compiler needs to be changed.

After running make posix, if the compilation succeeds, run the ls command and you will see many new files:
```
COPYING   gz         minirb.c    rc      rz.c    sz       undos.doc  zmodem.h
crc.c     mailer.rz  minirb.doc  README  rz.doc  sz.c     zcommand   zmr.c
crc.doc   Makefile   rb          rx      sb      sz.doc   zcommandi  zupl.t
crctab.c  Makefile~  rbsb.c      rz      sx      undos.c  zm.c
```
Copy rb, rx, rc, rz, sb, sx, sz, zcommand, and zcommandi to the bin directory of your root file system. Then copy the following libraries from your cross-compilation toolchain — ld-2.5.so, libc-2.5.so, libcrypt.so.1, libgcc_s.so.1, libm.so.6, ld-linux.so.3, libcrypt-2.5.so, libc.so.6, libm-2.5.so (the version numbers may differ, but as long as these files are present, it's acceptable) — into the lib directory of the root file system. Rebuild the root file system, download it to the development board, reboot, and test the rz and sz commands.

Command Usage:

sz /filename — Open Windows HyperTerminal, right-click and select "Receive File", set the destination directory, and confirm.

rz — In HyperTerminal, right-click and select "Send File" to transmit the file.

In my actual operation, I used the ldd command to check the dynamic libraries that rz and similar commands depend on. I found that they did not depend on any dynamic libraries. I only checked rz and sx; I'm not sure about the others. Therefore, when building the file system, I did not copy the aforementioned dynamic libraries into the lib directory.

Finally, testing with the rz command worked successfully.

Note:

If a command does not work, use the ldd command to check whether it depends on any dynamic libraries, and then port those libraries to the file system. Then it should work~~haha~~