Issues with Stacking Ethernet shield and USB Host shield I want to stack Ethernet shield and USB host together with my Arduino MEGA 2560.
Each of these shields works fine separately.
Is it necessary to contact bootloader pins with each shield and arduino board?
I have connected and tried, but the problem exists.
only one shield works fine at once.(always the sheild that directly connect to the Arduino board).
How do I resolve this problem ? I want to work all 2 shields at once.
these are the sheilds I have used.

Circuits At Home USB Host Shield v2.0
Ethernet Shield v5.0

Thank you
Both shields are SPI devices, and both shields seem to be hard-wired to use D10 as the chip select line.

In order for you to use both shields at once you will have to either modify one of them or connect the shield via jumper wires.

You will need to change the chip select connection on one of the shields from D10 to some other pin that is not currently used, and then modify your software (or the library) accordingly.