[R-engine-developers] First impressions

[Cedric C. <ri...@ha...>]

Dear list,

My first intentions were to skip the saa7114 completely to proceed with 
the mb86393. But then the first command I tried failed because, as I 
figured out by dumping it, the whole 1Mo of memory mapped registers are 
undef (that is, they all read as 0xfffffffff).

So, I suppose the SAA7114 initialization must be done before accessing 
this memory. I thus tried to fix the SA7713 part, mainly by trying other 
read/write addresses : the specs says its either 40h/41h or 42h/43h.
Sadly, whatever the address, I cannot write anything into the i2c bus. 
In fact, I cannot even write the write address : The first wait for 
acknowledge fails.

I do not know if it's the supposed SA7714 that do not answer because he 
didn't get the written values, or because he is not supposed to, or if 
its the whole I2C bus that's not handled the same way by the mb86393 
when he is attached a SA7114.

I also dumped the 256bytes controller io region, and it looks like there 
is actually "something" at io address GPIOREG, but perhaps the procedure 
to write to and read from the I2C bus have changed ?

At this point, I really would appreciate a datasheet of the mb86393. Any 
chance that we get one from Fujitsu ?