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81dd29f713
This reuses the existing `RPi::Mailbox` interface to read the command line via a VideoCore-specific mailbox message. This will have to be replaced if that interface starts being smarter, as this is needed very early, and nothing guarantees that a smarter Mailbox interface wouldn't need to allocate or log, which is a no-no during early boot. As the response string can be arbitrarily long, it's the caller's job to provide a long enough buffer for `Mailbox::query_kernel_command_line`. This commit chose 512 bytes, as it provides a large enough headroom over the 150-200 characters implicitly added by the VC firmware. The portable way would be to parse the `/chosen/bootargs` property of the device tree, but we currently lack the scaffolding for doing that. Support for this in QEMU relies on a patch that has not yet been accepted upstream, but is available via our `Toolchain/BuildQEMU.sh` script. It should, however, work on bare metal. Tested-By: Timon Kruiper <timonkruiper@gmail.com>