On Mon, 2009-10-19 at 16:45 -0600, John Rigby wrote:
Regarding 512x psc register maps:
The register map for 5125 does not just change the size of the registers. Some registers change locations. The issue is that the hardware guys decided to "fix" the old broken register access. The 5200, 5121, 5123 had some registers that were:
Function A when read but function B when written.
I would like to hear what the designer had for argument to justify that solution. Another favorite is the write only register.
GPIO without set/reset registers that force a read/modify/write cycle.
Then we have things that are more bugs than design
The "god" register that is not affected by any reset turning a reboot/reset into a game of chance.
The occasional write register. do { *reg =xx }while (*reg != xx)