Added arm64 assembly for examples/api crt0
I've encountered a problem when compiling the 'examples/api' directory for ARM64 in U-boot. The problem lies in the assembly code in 'examples/api/crt0.S' where the current CONFIG_ARM code is only 32-bit. When targeting ARM64, a 64-bit version is necessary.
I have proposed a fix by including a 'CONFIG_ARM64' section in the assembly code as shown below. These changes have been check via https://github.com/u-boot/u-boot/pull/538.
Feedback is welcome.
Signed-off-by: Kalen Brunham <kalen.brunham@intel.com>
diff --git a/examples/api/crt0.S b/examples/api/crt0.S
index 57bba9d..06f6d1f 100644
--- a/examples/api/crt0.S
+++ b/examples/api/crt0.S
@@ -33,6 +33,21 @@
str sp, [ip]
b main
+#elif defined(CONFIG_ARM64)
+
+ .text
+ .globl _start
+_start:
+ ldr ip0, =search_hint
+ str sp_el2, [ip0]
+ b main
+
+
+ .globl syscall
+syscall:
+ ldr ip0, =syscall_ptr
+ ldr pc_el2, [ip0]
+
.globl syscall
syscall: