via-cuda (CUDA_COMBINED_FORMAT_IIC)
PATCH 1/1 via-cuda (CUDA_COMBINED_FORMAT_IIC)
hi,
Attached are:
1/ a patch that adds CUDA_COMBINED_FORMAT_IIC support (at the moment to 2.2.17 - although it should go into 2.4.0 relatively easily). This allows you to dump the contents of things on the i2c bus (where it is supported) using via-cuda.
This has meant a modification of the cuda state machine, in the process I've made it a bit more paranoid about passed params & buffer overflows etc.
This release has an amount of (ifdef'd) debugging printks that will be removed if no-one reports any serious problems.
files patched:
drivers/macintosh/via-cuda.c
include/asm-ppc/adb.h
include/asm-ppc/cuda.h
It also adds support for using cuda adb in xmon for 2.2.x (separate patch to follow) - this is already done in 2.4.0.
2/ a small code fragment showing the use of the COMBINED_FORMAT_IIC command (you *must* set the adb request reply length to limit what you want back - since the cuda does not seem to stop sending voluntarily).
3/ the output of this when run on my G3-beige.
Unfortunately, the one chip I *really* want to probe (the TDA7433 on the audio card - i2c address 0x8a) doesn't seem to give a proper response... so if anyone knows more about this - I'd be interested.
Patches against linuxcare linux-pmac-benh as of approx. 00:00 BST 29/09/2000.
Should be equally OK against linux-pmac-stable.
I'll post them on sourceforge linuxppc & update my web page later...
Iain.
Hi Iain,
On 30 Aug, this message from Iain Sandoe echoed through cyberspace:
Quoted 3 lines
Unfortunately, the one chip I *really* want to probe (the TDA7433 on the audio card - i2c address
0x8a) doesn't seem to give a proper response... so if anyone knows more about this - I'd be interested.
Hmm, are you sure it is actually attached to the CUDA's I2C bus? The 7x00/8x00 series have a video input chip on an I2C bus as well, but not on CUDA... it's on PlanB, which includes its own I2C implementation. I don't know about the sound chips in those boxes, however. My first bet would be looking around AWACS if there is no I2C bus hidden there somewhere.
Michel
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