[ECOS] Excalibur AHB1 clock change

["J Jordaan" <jjordaan at sun dot ac dot za>]

Hi All

I've been trying to change the AHB1 clock of the Altera Excalibur Epxa1
board without any success. According to the datasheets you can change it in
a user application by first bypassing the PLL1. You do this by setting the
BP1 bit in the CLK_DERIVE register. I do this with the following commands :



cyg_uint32 reg;

HAL_READ_UINT32(EPXA1_CLK_BASE + _CLK_DERIVE, reg);
reg |= 0x1000;
HAL_WRITE_UINT32(EPXA1_CLK_BASE + _CLK_DERIVE, reg);



The moment I do this the whole system just hangs. When a bypass the PLL2
with the same commands, it works without a problem.

Does anybody know what the problem could be or what I'm doing wrong?

Thanks
Jacques


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