Re: Need to access Specific EHCI operational registers
- From: "eric" <eric.moirez@xxxxxx>
- Date: 1 Oct 2006 23:59:56 -0700
The purpose of this low level access is to write the I2C eeprom
connected to the NEC uPD720101. In this eeprom, there are the PCI
identification and some USB clock configuration.
We could always program the eeprom before mounting it on the board or
add specific complex hardware for that. But as some registers exist to
read/write the I2C eeprom in the EHCI operational regsiters, I would
like to access them
(only them) through the ehci.sys driver.
This driver must be mapping the PCI BAR and access to the standard area
of the EHCI operational regsiters.
Could it be possible to get the accesq through a filter driver?
I may always write a my own PCI driver but it looks like a lot work
aleady done in the standard drivers.
Eric
Doron Holan [MS] wrote:
there aren't any docs on this b/c this support doesn't exist. at what point
intime do you want to touch the registers? when the host controller powers
up? at runtime? if you still have control of the fw/hw design, put your
i2c functionality in a separate PCI function so that you can address them
w/your own driver w/out the usb core interfering.
d
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"eric" <eric.moirez@xxxxxx> wrote in message
news:1159517879.756404.116580@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I am developping a new PCI board with a NEC uPD720101.
I need to access the some specific registers in the EHCI operational
registers of the USB controler to program the I2C eeprom attached to
the NEC uPD720101.
I had a look in USB IOTCL available (IOCTL_USB_USER_REQUEST, ...) and I
could find any low level access to EHCI registers neither for user or
driver access.
Do you know if is possible or where I could find more documentation on
this?
Thanks,
Eric
.
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