hi I am a bit confused about two things 1) is the "ide" (disk read/write/boot) module intended to be PCI-MEM "memory-mapped" oriented concerning the harddrive? or is it PCI_IO oriented? there are too many layers of code and this makes me confused 2) what is the philosophy about initializing the PCI_bridge? and what is u-boot supposed to do concerning the device-tree-blog to be passed to the kernel?
there are pieces of code in the kernel source telling me this
* Older u-boots don't set PCI up properly. * Update the hardware to match the device tree. * The prefetch mem region and non-prefetch mem region * must be contiguous in the host bus. * As required by the PCI binding, PCI #addr/#size must be 3/2. * The parent bus must be 1/1. * Only 32-bit PCI is supported. * All three region types * prefetchable mem * non-prefetchable mem * I/O * must be present