what is the status (hardwired Level) of CFG_SEL[1] CFG_SEL[0]?
you hub can either be configured via an EEPROM connected to I2C Interface, strap option or from an SMB master, but not a mixture.
https://github.com/raspberrypi/linux/bl ... usb251xb.c configure the chip via SMBus
If memory serves me right the SMbus address is 0x2c -> that's one of the addresses for DSI8x.
do you run them from same Interface? SMbus is not equal to I2C, yes SMBus is derived from I2C but has different timings, drive currents and voltage swings.
https://www.analog.com/en/resources/des ... smbus.html
you hub can either be configured via an EEPROM connected to I2C Interface, strap option or from an SMB master, but not a mixture.
https://github.com/raspberrypi/linux/bl ... usb251xb.c configure the chip via SMBus
If memory serves me right the SMbus address is 0x2c -> that's one of the addresses for DSI8x.
do you run them from same Interface? SMbus is not equal to I2C, yes SMBus is derived from I2C but has different timings, drive currents and voltage swings.
https://www.analog.com/en/resources/des ... smbus.html
Statistics: Posted by aBUGSworstnightmare — Fri Nov 07, 2025 6:09 am