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powerpc/boot: Add a boot wrapper for Microwatt

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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
This commit is contained in:
Joel Stanley 2021-06-18 13:49:43 +10:00 committed by Michael Ellerman
parent c93f80849b
commit 4a21192e27
3 changed files with 33 additions and 0 deletions
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4
arch/powerpc/boot/Makefile
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@ -163,6 +163,8 @@ src-plat-$(CONFIG_PPC_POWERNV) += pseries-head.S
src-plat-$(CONFIG_PPC_IBM_CELL_BLADE) += pseries-head.S src-plat-$(CONFIG_PPC_IBM_CELL_BLADE) += pseries-head.S
src-plat-$(CONFIG_MVME7100) += motload-head.S mvme7100.c 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-wlib := $(sort $(src-wlib-y))
src-plat := $(sort $(src-plat-y)) src-plat := $(sort $(src-plat-y))
src-boot := $(src-wlib) $(src-plat) empty.c 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 # Board port in arch/powerpc/platform/amigaone/Kconfig
image-$(CONFIG_AMIGAONE) += cuImage.amigaone image-$(CONFIG_AMIGAONE) += cuImage.amigaone
image-$(CONFIG_PPC_MICROWATT) += dtbImage.microwatt
# For 32-bit powermacs, build the COFF and miboot images # For 32-bit powermacs, build the COFF and miboot images
# as well as the ELF images. # as well as the ELF images.
ifdef CONFIG_PPC32 ifdef CONFIG_PPC32

24
arch/powerpc/boot/microwatt.c Normal file
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@ -0,0 +1,24 @@
// 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();
}

5
arch/powerpc/boot/wrapper
View File

@ -342,6 +342,11 @@ gamecube|wii)
link_address='0x600000' link_address='0x600000'
platformo="$object/$platform-head.o $object/$platform.o" platformo="$object/$platform-head.o $object/$platform.o"
;; ;;
microwatt)
link_address='0x500000'
platformo="$object/fixed-head.o $object/$platform.o"
binary=y
;;
treeboot-currituck) treeboot-currituck)
link_address='0x1000000' link_address='0x1000000'
;; ;;