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authorMichael Niewöhner <foss@mniewoehner.de>2020-12-06 14:17:02 +0100
committerMichael Niewöhner <foss@mniewoehner.de>2020-12-10 02:25:13 +0000
commit7f623f8e466f2eb45d9b571f7e752f42eee5c3db (patch)
tree08e159bd0b9da1dbab0b7791a2ae9f392b10f7bc /src/mainboard/cavium
parent5d7fa16c5c7e625371a1fcffedff99027f8b35d8 (diff)
mb/supermicro/x11ssm-f: (re)configure and document various pads
(Re)configure various pads found by dissecting a dead board and vendor firmware, as well as the BMC firmware: - GPP_B14: input connected to jumper JBR1 - could be used to implement "BIOS Recovery" ("Top-Block Swap") functionality; external pull-up - GPP_C20: output to BMC alert CPU_THROTTLED# - can be used to notify the BMC about a thermal throttling event. Not implemented in vendor firmware. - GPP_C23: input connected to the CPU's CATERR# output; external pull-up Not actively used by vendor firmware. - GPP_D1: output connected to on-board and front panel power LEDs - GPP_D18: output connected to PERST# of both CPU PCIe Slots. Can be used for testing/debugging only, since it resets both slots at once. Not actively used by vendor firmware. - GPP_D19: output connected to PERST# of both PCH PCIe Slots. Can be used for testing/debugging only, since it resets both slots at once. Not actively used by vendor firmware. - GPP_D22: input connected to the BMC enable/disable jumper JPB1; Will be used later in CB:48096 and CB:48097; external pull-up - GPP_G0 - GPP_G3: dedicated/integrated CPU switching; probably not useful, since the IGD is not connected to any ports on this board. External pulls ensure correct function of a dGPU even without driving the gpios. Not used by vendor firmware. - GPP_G12 - GPP_G16: inputs for binary SKU_ID; external pulls - GPP_G20: PWRFAIL# input from JPI2C1 (pin 3); external pull-up; Not used by vendor firmware. Also add comments for documentation. While at it, mark ME-owned pads as reserved. Change-Id: I9f9328e9ce6f7e291b171f776bb98bc617b64b93 Signed-off-by: Michael Niewöhner <foss@mniewoehner.de> Reviewed-on: https://review.coreboot.org/c/coreboot/+/48098 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org> Reviewed-by: Christian Walter <christian.walter@9elements.com>
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