sh: Add support zimageboot command for Renesas SH
Curent U-Boot can boot zImage by use the "go" command.
But this is not right method. And this method can not set command-line
to linux kernel.
zimageboot sets command-line in environment of u-boot in linux kernel,
and provides function to boot it.
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
diff --git a/arch/sh/lib/zimageboot.c b/arch/sh/lib/zimageboot.c
new file mode 100644
index 0000000..dd413c0
--- /dev/null
+++ b/arch/sh/lib/zimageboot.c
@@ -0,0 +1,80 @@
+/*
+ * (C) Copyright 2010
+ * Renesas Solutions Corp.
+ * Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * Linux SuperH zImage loading and boot
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/zimage.h>
+
+int do_sh_zimageboot (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+ ulong (*zboot_entry)(int, char * const []) = NULL;
+ char *s0, *s1;
+ unsigned char *param = NULL;
+ char *cmdline;
+ char *bootargs;
+
+ disable_interrupts();
+
+ if (argc >= 3) {
+ /* argv[1] holds the address of the zImage */
+ s0 = argv[1];
+ /* argv[2] holds the address of zero page */
+ s1 = argv[2];
+ } else {
+ goto exit;
+ }
+
+ if (s0)
+ zboot_entry = (ulong (*)(int, char * const []))simple_strtoul(s0, NULL, 16);
+
+ /* empty_zero_page */
+ if (s1)
+ param = (unsigned char*)simple_strtoul(s1, NULL, 16);
+
+ /* Linux kernel command line */
+ cmdline = (char *)param + COMMAND_LINE;
+ bootargs = getenv("bootargs");
+
+ /* Clear zero page */
+ memset(param, 0, 0x1000);
+
+ /* Set commandline */
+ strcpy(cmdline, bootargs);
+
+ /* Boot */
+ zboot_entry(0, NULL);
+
+exit:
+ return -1;
+}
+
+U_BOOT_CMD(
+ zimageboot, 3, 0, do_sh_zimageboot,
+ "Boot zImage for Renesas SH",
+ ""
+);