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kboot: Expose m1n1 console log in phram MTD reserved memory node
This registers a log buffer IODEV similar to the frame buffer IODEV. It is using a console IODEV to allow writing to the buffer until m1n1 jumps to the next stage. This allows also to increase the buffer size without increasing m1n1's size. The current CONSOLE_BUFFER_SIZE of 8k is not large enough to hold the entire log of executing m1n1 under the hypervisor on the M1 Ultra Mac Studio. Signed-off-by: Janne Grunau <j@jannau.net>
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