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** Tags added: verification-needed-yakkety
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arm64: SPCR console not autodetected
Status in linux package in Ubuntu:
Status in linux source package in Yakkety:
ARM servers that boot in ACPI mode will not autodetect their console
settings. The SBSA (Server Base System Architecture) spec requires that these
settings be specified using the ACPI SPCR table. Support for parsing this table
just landed upstream in the 4.9 merge window.
Boot an ARM system in ACPI mode(I used a Cavium ThunderX CRB1S w/
acpi=force). You'll have no console unless you know and explicitly specify the
correct console= parameter on the cmdline.
The changes cleanly cherry-pick from upstream, so we'll have upstream support
for any regressions. Though the patches do touch code in arch-indep
directories, that code is limited by config options that restrict the
functionality to either ARM or OpenFirmware systems:
of/serial: move earlycon early_param handling to serial
- Cleanup of OF-specific code.
ACPI: parse SPCR and enable matching console
- Adds parse_spcr() for all archs, but this function is only called from
arch/arm64 code (next patch).
- Adds an arch-generic call to a stub function only if the OF-specific
earlycon parameter is specified. Further, that stub function just returns
-ENODEV on non-OF systems.
ARM64: ACPI: enable ACPI_SPCR_TABLE
- ARM64-specific code, only built if CONFIG_ACPI=y
serial: pl011: add console matching function
- Driver for ARM AMBA-type serial port - code is only activated if a
console=pl011,* parameter is specified on the cmdline.
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