When sandbox does a 'bootm' to run a kernel we cannot actually execute it.
So just exit sandbox, which is essentially what U-Boot does on other archs.
Also, allow sandbox to use bootm on any kernel, so that it can be used
to test booting of kernels from any architecture.

Signed-off-by: Simon Glass <s...@chromium.org>
Signed-off-by: Simon Glass <s...@chromium.org>
---
 arch/sandbox/cpu/cpu.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/arch/sandbox/cpu/cpu.c b/arch/sandbox/cpu/cpu.c
index cfc1fda..bc7641a 100644
--- a/arch/sandbox/cpu/cpu.c
+++ b/arch/sandbox/cpu/cpu.c
@@ -8,10 +8,16 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+void reset_cpu(ulong ignored)
 {
        /* This is considered normal termination for now */
        os_exit(0);
+}
+
+int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+       reset_cpu(0);
+
        return 0;
 }
 
@@ -28,7 +34,14 @@ unsigned long __attribute__((no_instrument_function)) 
timer_get_us(void)
 
 int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
 {
-       return -1;
+       if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
+               bootstage_mark(BOOTSTAGE_ID_RUN_OS);
+               printf("## Transferring control to Linux (at address 
%08lx)...\n",
+                      images->ep);
+               reset_cpu(0);
+       }
+
+       return 0;
 }
 
 int cleanup_before_linux(void)
-- 
1.8.4.1

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