On Fri, Oct 7, 2016 at 5:51 PM, Julius Werner <[email protected]> wrote:
> Also, I think all of these functions only work on non-x86 devices > right now so they're probably not really helpful to you (I'd be > surprised if they even compile and link for your board). The I2C API > is unfortunately one of those areas where x86 and non-x86 coreboot > still lead very separate side-by-side lives right now. For x86 you > probably need the i2c_dev_xxx() functions, which should in theory work > Skylake and Apollolake do support the I2C API and associated convenience functions. (finally!) The i2c driver used is common for intel chipsets since haswell(core) and baytrail(atom), it just needs a bit of glue layer to map bus number to a base address. I added the i2c_dev_* variants around the same time in order to support drivers where the bus+address comes from devicetree, but the functions that take a bus+address will work too. > similar but I have no experience with them. You might also need to use > the smbus_xxx() functions instead (SMBUS is some > kinda-the-same-but-not-quite thing related to I2C on x86 that I never > bothered to fully understand). > > I agree this is likely what is needed for the ASROCK IMB-A180 as it looks like there is an smbus driver in the southbridge. Look for i2c_smbus_send_byte() in include/device/smbus.h which is implemented in southbridge/amd/agesa/hudson/smbus.c -duncan > On Thu, Sep 29, 2016 at 3:10 PM, Haleigh Novak <[email protected]> wrote: > > Hello All, > > > > > > I am currently trying to send POST codes from Coreboot (downloaded > > approximately a month ago) to a Beagle I2C/SPI reader, specifically via > i2c. > > I don't know the register needed for i2c_writeb() so I figured I would > use > > i2c_raw_write(). In general since I have been unable to locate anything > > explaining the difference between the two functions I would really > > appriciate it if someone could explain it or direct me to where I can > find > > documentation. I am hoping that the explaination/resource will either > tell > > me where / or direct me to how I can figure out where the i2c_raw_write > will > > write to (if it will just write directly to the Beagle or somewhere > else)? > > Or would it be better to send it to a register with i2c_writeb()? I am > > running Coreboot on an ASROCK Mainboard, model IMB-A180. > > > > > > Thank you. > > > > > > HN > > > > > > -- > > coreboot mailing list: [email protected] > > https://www.coreboot.org/mailman/listinfo/coreboot > > -- > coreboot mailing list: [email protected] > https://www.coreboot.org/mailman/listinfo/coreboot >
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