cmd: download: Allow board specific download

Signed-off-by: Joseph Chen <[email protected]>
Change-Id: Ie26523b83bc8a91ea2fd77fadd78c134715db622

Author: JosephChen2017

cmd/download.c

@@ -8,10 +8,19 @@
 #include <command.h>
 #include <console.h>
 
+__weak void do_board_download(void)
+{
+}
+
 static int do_download(cmd_tbl_t *cmdtp, int flag,
 		       int argc, char * const argv[])
 {
 	disable_ctrlc(1);
+
+	/* Allow board specific download, maybe noreturn */
+	do_board_download();
+
+	/* Generic download */
 #ifdef CONFIG_CMD_ROCKUSB
 	run_command("rockusb 0 $devtype $devnum", 0);
 #endif