boot: Call flush() before booting

In a lot of cases kernel resets UART HW. To ensure that U-Boot messages
printed before booting the kernel are not lost, call new U-Boot console
flush() function.

Signed-off-by: Pali Rohár <[email protected]>
Reviewed-by: Simon Glass <[email protected]>

Author: pali

boot/bootm_os.c

@@ -303,6 +303,7 @@ static void do_bootvx_fdt(bootm_headers_t *images)
 #else
 	printf("## Starting vxWorks at 0x%08lx\n", (ulong)images->ep);
 #endif
+	flush();
 
 	boot_jump_vxworks(images);
 

cmd/boot.c

@@ -32,6 +32,7 @@ static int do_go(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 	addr = hextoul(argv[1], NULL);
 
 	printf ("## Starting application at 0x%08lX ...\n", addr);
+	flush();
 
 	/*
 	 * pass address parameter as argv[0] (aka command name),

cmd/elf.c

@@ -72,6 +72,7 @@ int do_bootelf(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 		return rcode;
 
 	printf("## Starting application at 0x%08lx ...\n", addr);
+	flush();
 
 	/*
 	 * pass address parameter as argv[0] (aka command name),
@@ -274,6 +275,7 @@ int do_bootvx(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 		puts("## Not an ELF image, assuming binary\n");
 
 	printf("## Starting vxWorks at 0x%08lx ...\n", addr);
+	flush();
 
 	dcache_disable();
 #if defined(CONFIG_ARM64) && defined(CONFIG_ARMV8_PSCI)