Hi, 
thanks a  lot for your responses,
> That just told you your root filesystem is READ ONLY system, And you
> can try create directory in  /var/tmp, that maybe exist a ramdisk that
> can be written.
> In your system I guess there is only one user :root. 
what do you get when entering the command
/> ls -l 
drwxr-xr-x  1 0        0              32  Jan  1 00:00 bin
drwxr-xr-x  1 0        0              32  Jan  1 00:00 dev
drwxr-xr-x  1 0        0              32  Jan  1 00:00 etc
drwxr-xr-x  1 0        0              32  Jan  1 00:00 home
drwxr-xr-x  1 0        0              32  Jan  1 00:00 lib
drwxr-xr-x  1 0        0              32  Jan  1 00:00 mnt
dr-xr-xr-x 22 0        0               0  Jan  1 00:00 proc
drwxr-xr-x  1 0        0              32  Jan  1 00:00 sbin
lrwxrwxrwx  1 0        0               8  Jan  1 00:00 tmp -> /var/tmp
drwxr-xr-x  1 0        0              32  Jan  1 00:00 usr
drwxr-xr-x  7 0        0            1024  Jan  1 00:00 var


I can create a folder under /var/tmp, but I want to login as a root

because my goal it's to compile a simple application under uClinux(with 
skyeye), 
for instance "hello world" on my emulator with gcc or other compilator. and 
obviously, my core does not know  this command of compilation GCC. 
So i should import  gcc  to my core  ...? 
how I can proceed, which are the stages I can follow? there isa link which can 
help me ? and thank you for you helps in advance.                             


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