On 10 May 2011 22:26, kang haiyang <[email protected]> wrote:
> hi,
>
> i saw some configurations in this file, but don't know the function of
> them.
> Where can i found the document about them, and are they hardware
> independent?
> i mean that they are valid for all board with the corresponding radio
> chip.
The ini values are register values written to the hardware to set it
up for use. This way there doesn't need to be a lot more code which
individually sets up all of those registers.
There's a bunch of different init values:
* Modes - the values which change based on the operating mode (a, bg,
na/40, ng/40, etc)
* Common - common register values which don't depend upon the operating mode
* BankX - for the older chips, they're involved with setting up the radio
* Addac - something radio/baseband ? I'm not sure.
* RFGain - setting up the baseband RF gain registers
There are other tables, such as Merlin rx and tx gain.
Yes, the initialisation values can be chip dependent. Some registers
won't be (eg the examples below should be be the same for all chips)
but there's plenty of register settings which are specific to a
particular mac/radio.
In terms of in-depth public documentation, you're not going to get a
lot of it. The stuff in Modes and Common are straight registers - the
first column is the register, the second (and later) values are
register contents. If the register name is defined in reg.h then you
can (partially) decode what the fields mean.
Eg from ar5008_initvals.h:
{0x00001030, 0x00000230, 0x00000460, 0x000002c0, 0x00000160,
0x000001e0},
{0x00001070, 0x00000168, 0x000002d0, 0x00000318, 0x0000018c,
0x000001e0},
0x1030 is AR_D_GBL_IFS_SIFS, and you can see from the other related
#defines that the lower four bits are the SIFS duration. If you look
at the code which writes to that register, you can see its in clocks,
rather than microseconds. So different values are needed based on
operating mode; 11b is 22mhz, 11g is 44mhz, 11a is 40mhz for non-fast
clock and 44mhz for fast-clock, it's double that for HT/40 modes.
0x1070 is AR_D_GBL_IFS_SLOT; same deal - lower four bits are the slot
duration in clock cycles. Same reason why they're different based on
operating mode.
Take a look at ar5008_hw_process_ini() to see how they're written to
the hardware.
HTH,
Adrian
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