SBBR mentions SPCR as a mandatory ACPI table. So enable it for ARM64 Earlycon should be set up as early as possible. ACPI boot tables are mapped in arch/arm64/kernel/acpi.c:acpi_boot_table_init() called from setup_arch() and that's where we parse SPCR. So it has to be opted-in per-arch.
Signed-off-by: Aleksey Makarov <[email protected]> --- arch/arm64/Kconfig | 1 + arch/arm64/kernel/acpi.c | 5 ++++- 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 07b6a16..c77b4b2 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -3,6 +3,7 @@ config ARM64 select ACPI_CCA_REQUIRED if ACPI select ACPI_GENERIC_GSI if ACPI select ACPI_REDUCED_HARDWARE_ONLY if ACPI + select ACPI_SPCR_TABLE if ACPI select ARCH_HAS_DEVMEM_IS_ALLOWED select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE select ARCH_HAS_ELF_RANDOMIZE diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c index d1ce8e2..046f095 100644 --- a/arch/arm64/kernel/acpi.c +++ b/arch/arm64/kernel/acpi.c @@ -189,7 +189,7 @@ void __init acpi_boot_table_init(void) */ if (param_acpi_off || (!param_acpi_force && of_scan_flat_dt(dt_scan_depth1_nodes, NULL))) - return; + goto done; /* * ACPI is disabled at this point. Enable it in order to parse @@ -209,6 +209,9 @@ void __init acpi_boot_table_init(void) if (!param_acpi_force) disable_acpi(); } + +done: + parse_spcr(); } #ifdef CONFIG_ACPI_APEI -- 2.7.4
