linux/arch/powerpc/boot/microwatt.c
Joel Stanley 4a21192e27 powerpc/boot: Add a boot wrapper for Microwatt
This allows microwatt's kernel to be built with an embedded device tree.

Load to arch/powerpc/boot/dtbImage.microwatt to 0x500000:

 mw_debug -b fpga stop load arch/powerpc/boot/dtbImage.microwatt 500000 start

Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Reviewed-by: Segher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/YMwX19wym3kQ7guu@thinks.paulus.ozlabs.org
2021-06-21 21:16:32 +10:00

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C

// SPDX-License-Identifier: GPL-2.0-or-later
#include <stddef.h>
#include "stdio.h"
#include "types.h"
#include "io.h"
#include "ops.h"
BSS_STACK(8192);
void platform_init(unsigned long r3, unsigned long r4, unsigned long r5)
{
unsigned long heapsize = 16*1024*1024 - (unsigned long)_end;
/*
* Disable interrupts and turn off MSR_RI, since we'll
* shortly be overwriting the interrupt vectors.
*/
__asm__ volatile("mtmsrd %0,1" : : "r" (0));
simple_alloc_init(_end, heapsize, 32, 64);
fdt_init(_dtb_start);
serial_console_init();
}