x1000: Redesign SPL, and allow it to flash the bootloader

SPL is now designed so core X1000 code is in control of the boot,
under the reasonable assumption that the device boots from flash.
It should not be too hard to adapt to other X1000 ports.

The biggest functional change is that the SPL can now read/write
the flash, under the control of a host computer. The SPL relies
on the boot ROM for USB communication, so the host has to execute
the SPL multiple times following a protocol.

Change-Id: I3ffaa00e4bf191e043c9df0e2e64d15193ff42c9

1 files changed, 66 insertions, 0 deletions

diff --git a/firmware/target/mips/ingenic_x1000/spl-x1000-defs.h b/firmware/target/mips/ingenic_x1000/spl-x1000-defs.h
new file mode 100644
index 0000000000..1d9f120ee2
--- /dev/null
+++ b/firmware/target/mips/ingenic_x1000/spl-x1000-defs.h
@@ -0,0 +1,66 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2021 Aidan MacDonald
+ *
+ * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#ifndef __SPL_X1000_DEFS_H__
+#define __SPL_X1000_DEFS_H__
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define SPL_CMD_BOOT        0
+#define SPL_CMD_FLASH_READ  1
+#define SPL_CMD_FLASH_WRITE 2
+
+#define SPL_BOOTOPT_CHOOSE   0
+#define SPL_BOOTOPT_ROCKBOX  1
+#define SPL_BOOTOPT_ORIG_FW  2
+#define SPL_BOOTOPT_RECOVERY 3
+#define SPL_BOOTOPT_NONE     4
+
+#define SPL_FLAG_SKIP_INIT   (1 << 0)
+
+#define SPL_MAX_SIZE          (12 * 1024)
+#define SPL_LOAD_ADDRESS      0xf4001000
+#define SPL_EXEC_ADDRESS      0xf4001800
+#define SPL_ARGUMENTS_ADDRESS 0xf40011f0
+#define SPL_STATUS_ADDRESS    0xf40011e0
+#define SPL_BUFFER_ADDRESS    0xa0004000
+
+struct x1000_spl_arguments {
+    uint32_t command;
+    uint32_t param1;
+    uint32_t param2;
+    uint32_t flags;
+};
+
+struct x1000_spl_status {
+    int err_code;
+    int reserved;
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __SPL_X1000_DEFS_H__ */