25 lines
882 B
ReStructuredText
25 lines
882 B
ReStructuredText
P9 memory hierarchy
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-------------------
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P9 Nimbus supports direct attached DDR memory through 4 DDR ports per side
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of the processor. Device tree contains memory hierarchy so that one can
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traverse from chip to DIMM like below:
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xscom@<addr>/mcbist@<mcbist_id>/mcs@<mcs_id>/mca@<mca_id>/dimm@<resource_id>
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Example of dimm node:
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.. code-block:: dts
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dimm@d00e {
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memory-id = <0xc>; /* DRAM Device Type. 0xc = DDR4 */
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product-version = <0x32>; /* Module Revision Code */
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device_type = "memory-dimm-ddr4";
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serial-number = <0x15d9ad1c>;
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status = "okay";
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size = <0x4000>;
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phandle = <0xd2>;
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ibm,loc-code = "UOPWR.0000000-Node0-DIMM14";
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part-number = "36ASF2G72PZ-2G6B2 ";
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reg = <0xd00e>;
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manufacturer-id = <0x802c>; /* Vendor ID, we can get vendor name from this ID */
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};
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