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cascaded timers

i tried using cascade mode for the timers in kernel 2.4.14, running the
combined 16-bit timer at 6250kHz to get better precision than 52 us. I
know that kernel 2.4.19 has microsecond precision timing using the
prescaler, so I should be able to get it using cascaded mode timers
also. However, if I try reading (unsigned short)(*R_TIMER01_DATA), I get
updated values only every 40us. What could be wrong?