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Utilising 36bit physical addressing in U-Boot and Linux

Posted: 30 Mar 2010     Print Version  Bookmark and Share

Keywords:36bit physical addressing  U-Boot Linux  36bit addressing 

Many of Freescale Semiconductor's PowerPC cores, including both the e600 and e500v2 processor families and their derivatives, provide support for 36bit physical addressing. This support enables the processor core to access 64Gbytes of physical address space, increasing the amount of memory and device address space supported by the system. This is increasingly necessary as more and more embedded systems require large amounts of memory.

This application note explains how to enable and utilise 36bit physical addressing. In particular, it describes the 36bit capabilities of the e600 and e500v2, and later processor families. It also details how U-Boot and Linux have been modified to support this feature and explains the limitations of this support. Note that the U-Boot and Linux descriptions specified in the document only describe the operation of the software as implemented for platforms based on the e600 and e500 processor families.

View the PDF document for more information.

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