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authorLeah Rowe <leah@libreboot.org>2024-04-06 02:09:04 +0100
committerLeah Rowe <leah@libreboot.org>2024-04-06 02:09:04 +0100
commite9c591a5547f48b2fce3337a502e87da6833d6d5 (patch)
treef9252e25fb66cdc1a4b41e76ae4c71539e07315e /script/update/trees
parent4134a883d0d8dd4020f2ddca7416e0b9f82b8843 (diff)
add t440p/w541 configs using broadwell mrc
broadwell mrc enables both igpu and dgpu to be enabled at any given time. if the onboard (intel) gpu is set as primary, the logic to disable it is not executed within coreboot; instead, the igpu is used for vga decode. on some t440p/w541 thinkpads, both an intel and nvidia gpu are present. in this setup, the intel gpu must be used for vga, and all output, but rendering can be offloaded to the nvidia gpu (nvidia optimus). optimus would never work on haswell mrc.bin, because it always disables the igpu when a dgpu is present, so a hack exists in coreboot that hides the dgpu from mrc, so that the igpu remains enabled. broadwell mrc doesn't do this, so the option to hide PEG devices has been disabled in these configs. the broadwell mrc has better peg device handling, and can support 16gb modules on broadwell hardware; it may well support these modules on haswell hardware too, though ddr3 sodimms are very hard to find (and expensive). (and currently untested, with this patch) Signed-off-by: Leah Rowe <leah@libreboot.org>
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