Raul Rangel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/45479 )
Change subject: soc/amd/picasso/acpi: add UART DMA controller devices ......................................................................
Patch Set 2:
(1 comment)
https://review.coreboot.org/c/coreboot/+/45479/1/src/soc/amd/picasso/acpi/sb... File src/soc/amd/picasso/acpi/sb_fch.asl:
https://review.coreboot.org/c/coreboot/+/45479/1/src/soc/amd/picasso/acpi/sb... PS1, Line 182: Device (DMA3) {
Ahh. I see. […]
https://source.chromium.org/chromiumos/chromiumos/codesearch/+/master:src/th...
* Accordingly to ACPI 5.0 Specification Table 6-170 "Fixed DMA Resource * Descriptor": * DMA Request Line bits is a platform-relative number uniquely * identifying the request line assigned. Request line-to-Controller * mapping is done in a controller-specific OS driver. * That's why we can safely adjust slave_id when the appropriate controller is * found.
https://source.chromium.org/chromiumos/chromiumos/codesearch/+/master:src/th...
I haven't found where the relative indexes are assigned.