[U-Boot] TLB mapping for pcie mem space for fsl corenet processors
hi, The tlb entries for the pcie mem space for the corenet SoC's is done for 1.5GiB but certain boards use all the 4 pcie controller instantiations, and each controller is assigned 512MiB size in the config files. Should the tlb entries not map 2GiB space as against 1.5GiB. Am i missing something. Thanks.
-sughosh
On 07/04/2013 01:13:29 PM, Sughosh Ganu wrote:
hi, The tlb entries for the pcie mem space for the corenet SoC's is done for 1.5GiB but certain boards use all the 4 pcie controller instantiations, and each controller is assigned 512MiB size in the config files. Should the tlb entries not map 2GiB space as against 1.5GiB. Am i missing something. Thanks.
You'll need to either use a smaller mapping for one or more PCIe controllers, or reduce the amount of RAM you map. There's no room to map 2GiB of RAM, 2GiB of PCIe, *and* CCSR, localbus, etc.
Do you really need to access devices on all four controllers from within U-Boot?
-Scott
hi Scott,
On Tue, Jul 9, 2013 at 12:37 AM, Scott Wood scottwood@freescale.com wrote:
On 07/04/2013 01:13:29 PM, Sughosh Ganu wrote:
hi, The tlb entries for the pcie mem space for the corenet SoC's is done for 1.5GiB but certain boards use all the 4 pcie controller instantiations, and each controller is assigned 512MiB size in the config files. Should the tlb entries not map 2GiB space as against 1.5GiB. Am i missing something. Thanks.
You'll need to either use a smaller mapping for one or more PCIe controllers, or reduce the amount of RAM you map. There's no room to map 2GiB of RAM, 2GiB of PCIe, *and* CCSR, localbus, etc.
Do you really need to access devices on all four controllers from within U-Boot?
Not on my custom board. I am using a single pcie controller and a much smaller mem space mapping. But my question was more from the point of view of the fsl reference boards. My confusion stemmed from the incompatibility in the tlb mappings and the mem space mentioned in the config files of certain corenet reference boards.
-sughosh
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Scott Wood -
Sughosh Ganu