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Diffstat (limited to 'Documentation/drivers/ipmi_kcs.md')
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diff --git a/Documentation/drivers/ipmi_kcs.md b/Documentation/drivers/ipmi_kcs.md new file mode 100644 index 000000000000..f6f0fb986a62 --- /dev/null +++ b/Documentation/drivers/ipmi_kcs.md @@ -0,0 +1,47 @@ +# IPMI KCS driver + +The driver can be found in `src/drivers/ipmi/`. It works with BMC that provide +a KCS I/O interface as specified in the [IPMI] standard. + +The driver detects the IPMI version, reserves the I/O space in coreboot's +resource allocator and writes the required ACPI and SMBIOS tables. + +## For developers + +To use the driver, select the `IPMI_KCS` Kconfig and add the following PNP +device under the LPC bridge device (in example for the KCS at 0xca2): + +``` + chip drivers/ipmi + device pnp ca2.0 on end # IPMI KCS + end +``` + +**Note:** The I/O base address needs to be aligned to 2. + +The following registers can be set: + +* `have_nv_storage` + * Boolean + * If true `nv_storage_device_address` will be added to SMBIOS type 38. +* `nv_storage_device_address` + * Integer + * The NV storage address as defined in SMBIOS spec for type 38. +* `bmc_i2c_address` + * Integer + * The i2c address of the BMC. zero if not applicable. +* `have_apic` + * Boolean + * If true the `apic_interrupt` will be added to SPMI table. +* `apic_interrupt` + * Integer + * The APIC interrupt used to notify about a change on the KCS. +* `have_gpe` + * Boolean + * If true the `gpe_interrupt` will be added to SPMI table. +* `gpe_interrupt` + * Integer + * The bit in GPE (SCI) used to notify about a change on the KCS. + + +[IPMI]: https://www.intel.com/content/dam/www/public/us/en/documents/product-briefs/ipmi-second-gen-interface-spec-v2-rev1-1.pdf |