Difference between revisions of "Skiboot/NVRAM"

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(Created page with "Loose collection of known NVRAM settings in Skiboot: == pcie-max-link-speed == Description: PCIe Link Speed Cap To cap the link speed, change the "pcie-max-link-speed" vari...")
 
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Loose collection of known NVRAM settings in Skiboot:
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= Known NVRAM settings in Skiboot =
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A loose collection of known NVRAM settings in Skiboot.  These should eventually be exposed via the Petiboot TUI.
  
 
== pcie-max-link-speed ==
 
== pcie-max-link-speed ==
  
Description: PCIe Link Speed Cap
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=== Description ===
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PCIe Link Speed Cap
  
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=== Details ===
 
To cap the link speed, change the "pcie-max-link-speed" variable to the maximum generation you want to support and re-IPL the machine. For instance, to cap at PCIe Generation 3, in the petitboot command line type:
 
To cap the link speed, change the "pcie-max-link-speed" variable to the maximum generation you want to support and re-IPL the machine. For instance, to cap at PCIe Generation 3, in the petitboot command line type:
  
 
  <nowiki>nvram -p ibm,skiboot --update-config pcie-max-link-speed=3</nowiki>
 
  <nowiki>nvram -p ibm,skiboot --update-config pcie-max-link-speed=3</nowiki>

Revision as of 16:08, 18 October 2018

Known NVRAM settings in Skiboot

A loose collection of known NVRAM settings in Skiboot. These should eventually be exposed via the Petiboot TUI.

pcie-max-link-speed

Description

PCIe Link Speed Cap

Details

To cap the link speed, change the "pcie-max-link-speed" variable to the maximum generation you want to support and re-IPL the machine. For instance, to cap at PCIe Generation 3, in the petitboot command line type:

nvram -p ibm,skiboot --update-config pcie-max-link-speed=3