Commit 4a21192e authored by Joel Stanley's avatar Joel Stanley Committed by Michael Ellerman
Browse files

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: default avatarJoel Stanley <joel@jms.id.au>
Signed-off-by: default avatarPaul Mackerras <paulus@ozlabs.org>
Reviewed-by: default avatarSegher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/YMwX19wym3kQ7guu@thinks.paulus.ozlabs.org
parent c93f8084

arch/powerpc/boot/Makefile

+4 −0
Original line number Diff line number Diff line
@@ -163,6 +163,8 @@ src-plat-$(CONFIG_PPC_POWERNV) += pseries-head.S 
src-plat-$(CONFIG_PPC_IBM_CELL_BLADE) += pseries-head.S

src-plat-$(CONFIG_MVME7100) += motload-head.S mvme7100.c



src-plat-$(CONFIG_PPC_MICROWATT) += fixed-head.S microwatt.c



src-wlib := $(sort $(src-wlib-y))

src-plat := $(sort $(src-plat-y))

src-boot := $(src-wlib) $(src-plat) empty.c
@@ -355,6 +357,8 @@ image-$(CONFIG_MVME5100) += dtbImage.mvme5100 
# Board port in arch/powerpc/platform/amigaone/Kconfig

image-$(CONFIG_AMIGAONE)		+= cuImage.amigaone



image-$(CONFIG_PPC_MICROWATT)		+= dtbImage.microwatt



# For 32-bit powermacs, build the COFF and miboot images

# as well as the ELF images.

ifdef CONFIG_PPC32

arch/powerpc/boot/microwatt.c

0 → 100644
+24 −0
Original line number Diff line number Diff line 
// 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();

}

arch/powerpc/boot/wrapper

+5 −0
Original line number Diff line number Diff line
@@ -342,6 +342,11 @@ gamecube|wii) 
    link_address='0x600000'

    platformo="$object/$platform-head.o $object/$platform.o"

    ;;

microwatt)

    link_address='0x500000'

    platformo="$object/fixed-head.o $object/$platform.o"

    binary=y

    ;;

treeboot-currituck)

    link_address='0x1000000'

    ;;