--- Quote Start ---
SopcBuilder:
How many Jtag-Uarts are needed, if I use two cpus?
( I have used two jtags, each of them connected to one cpu, cpu0 runs uclinux system, cpu1 runs helloworld example without a system, uclinux could be booted, but paused at the information of jtag-uart, cpu1 with helloworld program is successful)
--- Quote End ---
You can have two jtag-uarts as components but physically there is only one UART. So, at a time, only one cpu can use it. You can try writing a code which allows the two cpus to effectively share this uart based on message-boxes etc.
--- Quote Start ---
The purpose of my multiprocessor project is to do paralell working.A uclinux system with several piece of working programs.
One storage space can only be accessed by one periphery at a time.How could make the parelell (several programs) work together?
--- Quote End ---
In a multi-processor system, when a particular resource can be used by only one processor at a time, then you need to create an effective mechanism (mail-boxes etc) through which one processors can signal the other one when it is using and not using this resource. Also, several times, you may not need multi-processor system - a multi-threaded single processor system may be suffice for parallel tasks.
Honored Contributor
