Changes between Version 3 and Version 4 of ventana/PCIe

Timestamp:

01/18/2018 11:12:14 PM (7 years ago)

Author:

Bobby Jones

Comment:

Added information regarding pcie in the bootloader

ventana/PCIe

@@ -175 +175 @@
 PCIe 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]
 
+== PCIe In U-Boot ==
+To 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.
+
+{{{
+setenv pcidisable; saveenv; reset
+}}}
+
+Once cleared and after board reset, pci devices should enumerate as expected. 
+
+You can further interact with the pci subsystem via the {{{pci}}} command.