i designed one design that is full of references to the QSB,.and
one board can boot from sd and works fine,but the other board is
not ok .i uused the external power boxeri to supply the power and
the power is 12v,and i used one dc-dc to make 5v.if not plug the
sd into the socket,the power is 12v,but when plug the sd into the
socket ,the power is down to 5v.and when i plug the sd (no
program) into the socket, the power is 12v and all power of the
imx53 is fine .so i want to know what happens .thanks a lot !