Changes between Version 3 and Version 4 of ventana/PCIe


Ignore:
Timestamp:
01/18/2018 03:12:14 PM (9 months ago)
Author:
Bobby Jones
Comment:

Added information regarding pcie in the bootloader

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  • ventana/PCIe

    v3 v4  
    175175PCIe reset signals are typically always controlled by the kernel and software, however, they also can at times be controlled via a GPIO, with more details [wiki:gpio#GPIOmapping here]
    176176
     177== PCIe In U-Boot ==
     178To avoid PCI and PCIe related issues in Linux, the default bootloader behavior is to disable all pci until booting to Linux. In order to use any pci or pcie devices while in the bootloader, the {{{pcidisable}}} environment variable must be cleared.
     179
     180{{{
     181setenv pcidisable; saveenv; reset
     182}}}
     183
     184Once cleared and after board reset, pci devices should enumerate as expected.
     185
     186You can further interact with the pci subsystem via the {{{pci}}} command.