In message 20040202150228.41627.qmail@web15203.mail.bjs.yahoo.com you wrote:
1.Is ramdisk a must or not for embedded application?In
It is definitely NOT a must. There are many ways where to put the root filesystem. The ramdisk may be one of the most simple ways to get started, but there are very few projects whereit is the optimal solution.
In general, using a ramdisk is NOT optimal.
and some web pages,they say an initrd image is needed for loading your SCSI module at boot time.So if I didn't use SCSI module,I would save the initrd image.Is that so?
Please don't compare things that have nothing to do with each other. Booting a general purpose system is one thing (here you have one generic kernel image which will have to work on many, many different hardware configurations, and extensive use of driver modules is a must), while an embedded system is a completely different story (here you have one fix hardware configuration and normally you don't use any modules at all).
2.What advantage does ramdisk have?In which situation should we use it?
It is easy to build and to test.
I cannot think of a situation where a ramdisk image is the best way to go for embedded systems.
ramdisk).It displayed "Application running".What does application refer to?Busybox or ramdisk itself?If I
Application refers to the "/bin/application" script.
want to make my added application in ramdisk run automatically,how should I do?
Add it, and make sure it gets started (like by editing /etc/inittab).
Best regards,
Wolfgang Denk