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authorJoel Stanley <joel@jms.id.au>2021-06-18 13:49:43 +1000
committerMichael Ellerman <mpe@ellerman.id.au>2021-06-21 21:16:32 +1000
commit4a21192e2796c3338c4b0083b494a84a61311aaf (patch)
treee0db7c3fdef3ff7fc3e025f03f070bf992c3c88a /arch/powerpc/boot
parentc93f80849bdd9b45d834053ae1336e28f0026c84 (diff)
downloadlinux-4a21192e2796c3338c4b0083b494a84a61311aaf.tar.bz2
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
Diffstat (limited to 'arch/powerpc/boot')
-rw-r--r--arch/powerpc/boot/Makefile4
-rw-r--r--arch/powerpc/boot/microwatt.c24
-rwxr-xr-xarch/powerpc/boot/wrapper5
3 files changed, 33 insertions, 0 deletions
diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index e8e9d17af43b..e312ea802aa6 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -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
diff --git a/arch/powerpc/boot/microwatt.c b/arch/powerpc/boot/microwatt.c
new file mode 100644
index 000000000000..ca9d83617fc1
--- /dev/null
+++ b/arch/powerpc/boot/microwatt.c
@@ -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();
+}
diff --git a/arch/powerpc/boot/wrapper b/arch/powerpc/boot/wrapper
index cdb796b76e2e..1f4676bab786 100755
--- a/arch/powerpc/boot/wrapper
+++ b/arch/powerpc/boot/wrapper
@@ -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'
;;