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MG35Firmware

Page history last edited by Vasile 11 years, 11 months ago

General
Booting process
Root filesystem
1. /bin
2. /sbin
3. /img
4. /fonts
5. /proc
6. /usr
7. /opt
NVRAM configuration settings
(Ethernet) EEPROM configuration

General

MG35 it's running a ucLinux port for ARM processors without an MMU (the JASPER architecture platform).

Booting process

A starting point to understand the boot process of Sigma Designs - based players is this document. There is also a Flash presentation of the Linux boot process for embedded devices.

At startup, MG35 will

execute the bootloader
if no char received at the serial console, bootloader will load the kernel

The kernel will

mount the root filesystem (cramfs)
run /bin/init, which is actually a renamed version of the sash shell.

Sash will

set up a default path
run /etc/sashrc.

Sashrc does very little:

a few mknods
starts dvdplayer in the background.
in our custom firmware, this is the place where we start our own startup scripts.

DVDplayer is the GUI and the control program.

About the first thing that dvdplayer.bin does is call setup.
then it runs continuously in the background, waiting for button presses on the front panel or on the remote. If needed, it will call other programs to play the media files.