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1.4. SOFTWARE

The command help will list the built-in shell commands.

An important ﬁle is /etc/rc, the start-up ﬁle, which is shown in Listing 1.4. If

you want to change the start-up behavior of µClinux this the ﬁle to change. In a

running µClinux this ﬁle resides in a non-writable ﬁle system. A new system must be

recompiled on a host computer, downloaded over the serial port and ﬂashed to the ﬂash

memory. It is very unlikely that you have to do this in the course of this lab series.

Listing 1.4: µClinux conﬁguration ﬁle /etc/rc

# ! / b i n / sh

s e t e n v PATH / b i n : / s b i n : / u s r / b i n

hostname b e n d e r

mount −t p r o c none / p r o c

/ b i n / e x pand / r a m fs 5 12 . img / dev / ram1

mount −t e x t 2 / dev / ram1 / v a r

mk d ir / v a r / l o g / v a r / l o g / boa / v a r / l o c k / v a r / tmp / v a r / r u n

chmod 777 / v a r / tmp

/ b i n / e x pand / r a m fs8 1 9 2 . img / dev / ram2

mount −t e x t 2 / dev / ram2 / mnt

mk d ir / mnt / b i n

# S e t up t h e w e b s e r v e r s t u f f

mk d ir / mnt / h t d o c s

cp / misc / ∗ / mnt / h t d o c s

mk d ir / mnt / h t d o c s / c gi −b i n

# B r i n g up t h e l o c a l i n t e r f a c e

/ s b i n / i f c o n f i g l o 1 2 7 . 0 . 0 . 1

/ s b i n / r o u t e add −n e t 1 2 7 . 0 . 0 . 0

# S e t IP a d d r e s s f r om c o n f i g u r a t i o n d a t a i n f l a s h

/ s b i n / s e t i p

# S t a r t t h e web s e r v e r

/ s b i n / boa −d &

Running programs under µClinux

We demonstrate how to run a program in the µClinux environment by an example.

The program, shown in Listing 1.5, displays the contents of a Special Purpose Reg-

ister (SPR). It uses inline assembler to read a register. We use the Makeﬁle shown in

Listing 1.6 to compile the program shown in Listing 1.5. The ﬂags -r and -d to $CC

are important, otherwise the program will not execute.

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Cypress DCT-1D Guida Utente Pagina 21