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authorFurquan Shaikh <furquan@google.com>2020-05-20 21:37:51 -0700
committerPatrick Georgi <pgeorgi@google.com>2020-06-06 09:27:44 +0000
commit70001fe1f7c26ff13a84abf397a881189fa54c10 (patch)
treefe4504228f6e932370c25b4304f7da29ae79a324 /src
parentae96874e4805f01f68c56128c78ad1c3bab19bde (diff)
util: Add spd_tools to generate SPDs for TGL and JSL boards
Serial Presence Detect (SPD) data for memory modules is used by Memory Reference Code (MRC) for training the memory. This SPD data is typically obtained from part vendors but has to be massaged to format it correctly as per JEDEC and MRC expectations. There have been numerous times in the past where the SPD data used is not always correct. In order to reduce the manual effort of creating SPDs and generating DRAM IDs, this change adds tools for generating SPD files for LPDDR4x memory used in memory down configurations on Intel Tiger Lake (TGL) and Jasper Lake (JSL) based platforms. These tools generate SPDs following JESD209-4C specification and Intel recommendations (doc Two tools are provided: * gen_spd.go: Generates de-duplicated SPD files using a global memory part list provided by the mainboard in JSON format. Additionally, generates a SPD manifest file (in CSV format) with information about what memory part from the global list uses which of the generated SPD files. * gen_part_id.go: Allocates DRAM strap IDs for different LPDDR4x memory parts used by the board. Takes as input list of memory parts used by the board (with one memory part on each line) and the SPD manifest file generated by gen_spd.go. Generates Makefile.inc for integrating the generated SPD files in the coreboot build. BUG=b:155239397,b:147321551 Change-Id: Ia9b64d1d48371ccea1c01630a33a245d90f45214 Signed-off-by: Furquan Shaikh <furquan@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/41612 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Nick Vaccaro <nvaccaro@google.com> Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
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