Merge tag 'arc-updates-for-2018.07-rc2' of git://git.denx.de/u-boot-arc

Here we just add a tool for HSDK flashable images preparation
together with extensive documentation for HSDK board.

This will help real-life users to update U-Boot on the board.

3 files changed, 281 insertions, 0 deletions

diff --git a/board/synopsys/hsdk/README b/board/synopsys/hsdk/README
new file mode 100644
index 0000000000..e3793e4829
--- /dev/null
+++ b/board/synopsys/hsdk/README
@@ -0,0 +1,121 @@
+================================================================================
+Useful notes on bulding and using of U-Boot on ARC HS Development Kit (AKA HSDK)
+================================================================================
+
+   BOARD OVERVIEW
+
+   The DesignWare ARC HS Development Kit is a ready-to-use platform for rapid
+   software development on the ARC HS3x family of processors.
+
+   For more information please visit:
+   https://www.synopsys.com/dw/ipdir.php?ds=arc-hs-development-kit
+
+   User guide is availalble here:
+   https://github.com/foss-for-synopsys-dwc-arc-processors/ARC-Development-Systems-Forum/wiki/docs/ARC_HSDK_User_Guide.pdf
+
+   It has the following features useful for U-Boot:
+    * On-board 2-channel FTDI TTL-to-USB converter
+      - The first channel is used for serial debug port (which makes it possible
+        to use a serial connection on pretty much any host machine be it
+        Windows, Linux or Mac).
+        On Linux machine typucally FTDI serial port would be /dev/ttyUSB0.
+        There's no HW flow-control and baud-rate is 115200.
+
+      - The second channel is used for built-in Digilent USB JTAG probe.
+        That means no extra hardware is required to access ARC core from a
+        debugger on development host. Both proprietary MetaWare debugger and
+        open source OpenOCD + GDB client are supported.
+
+      - Also with help of this FTDI chip it is possible to reset entire
+        board with help of a special `rff-ftdi-reset` utility, see:
+        https://github.com/foss-for-synopsys-dwc-arc-processors/rff-ftdi-reset
+
+    * Micro SD-card slot
+      - U-Boot expects to see the very first partition on the card formatted as
+        FAT file-system and uses it for keeping its environment in `uboot.env`
+        file. Note uboot.env is not just a text file but it is auto-generated
+        file created by U-Boot on invocation of `saveenv` command.
+        It contains a checksum which makes this saved environment invalid in
+        case of maual modification.
+
+      - There might be more useful files on that first FAT partition like
+        Linux kernl image in form of uImage (with or without built-in
+        initramfs), device tree blob (.dtb) etc.
+
+      - Except FAT partition there might be others following the first FAT one
+        like Ext file-system with rootfs etc.
+
+    * 1 Gb Ethernet socket
+      - U-Boot might get payload from TFTP server. This might be uImage, rootfs
+        image and anything else.
+
+    * 2 MiB of SPI-flash
+      - SPI-flahs is used as a storage for image of an application auto-executed
+        by bootROM on power-on. Typically U-Boot gets programmed there but
+        there might be other uses. But note bootROM expects to find a special
+        header preceeding application image itself so before flashing anything
+        make sure required image is prepended. In case of U-Boot this is done
+        by invocation of `headerize-hsdk.py` with `make bsp-generate` command.
+
+
+   BUILDING U-BOOT
+
+   1. Configure U-Boot:
+      ------------------------->8----------------------
+      make hsdk_defconfig
+      ------------------------->8----------------------
+
+   2. To build Elf file (for example to be used with host debugger via JTAG
+      connection to the target board):
+      ------------------------->8----------------------
+      make mdbtrick
+      ------------------------->8----------------------
+
+      This will produce `u-boot` Elf file.
+
+   3. To build artifacts required for U-Boot update in n-board SPI-flash:
+      ------------------------->8----------------------
+      make bsp-generate
+      ------------------------->8----------------------
+
+      This will produce `u-boot.head` and `u-boot-update.scr` which should
+      be put on the first FAT partition of micro SD-card to be inserted in the
+      HSDK board.
+
+
+   EXECUTING U-BOOT
+
+   1. The HSDK board is supposed to auto-start U-Boot image stored in on-board
+      SPI-flash on power-on. For that make sure DIP-switches in the corner of
+      the board are in their default positions: BIM in 1:off, 2:on state
+      while both BMC and BCS should be in 1:on, 2:on state.
+
+   2. Though it is possible to load U-Boot as a simple Elf file via JTAG right
+      in DDR and start it from the debugger.
+
+      2.1. In case of proprietary MetaWare debugger run:
+      ------------------------->8----------------------
+      mdb -digilent -run -cl u-boot
+      ------------------------->8----------------------
+
+
+   UPDATION U-BOOT IMAGE IN ON-BOARD SPI-FLASH
+
+   1. Create `u-boot.head` and `u-boot-update.scr` as discribed above with
+      `make bsp-generate` command.
+
+   2. Copy `u-boot.head` and `u-boot-update.scr` to the first the first FAT
+      partition of micro SD-card.
+
+   3. Connect USB cable from the HSDK board to the developemnt host and
+      fire-up serial terminal.
+
+   3. Insert prepared micro SD-card in the HSDK board, press reset button
+      and stop auto-execution of existing `bootcmd` pressing any key in serial
+      terminal and enter the following command:
+      ------------------------->8----------------------
+      mmc rescan && fatload mmc 0:1 ${loadaddr} u-boot-update.scr && source ${loadaddr}
+      ------------------------->8----------------------
+      Wait before you see "u-boot update: OK" message.
+
+   4. Press RESET button and enjoy updated U-Boot version.
diff --git a/board/synopsys/hsdk/config.mk b/board/synopsys/hsdk/config.mk
new file mode 100644
index 0000000000..16fb59c438
--- /dev/null
+++ b/board/synopsys/hsdk/config.mk
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (C) 2018 Synopsys, Inc. All rights reserved.
+
+bsp-generate: u-boot u-boot.bin
+	$(Q)python3 $(srctree)/board/$(BOARDDIR)/headerize-hsdk.py \
+		--arc-id 0x52 --image $(srctree)/u-boot.bin \
+		--elf $(srctree)/u-boot
+	$(Q)mkimage -T script -C none -n 'uboot update script' \
+		-d $(srctree)/u-boot-update.txt \
+		$(srctree)/u-boot-update.scr &> /dev/null
diff --git a/board/synopsys/hsdk/headerize-hsdk.py b/board/synopsys/hsdk/headerize-hsdk.py
new file mode 100644
index 0000000000..fce749723e
--- /dev/null
+++ b/board/synopsys/hsdk/headerize-hsdk.py
@@ -0,0 +1,149 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (C) 2018 Synopsys, Inc. All rights reserved.
+# Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
+
+import os, getopt, sys, zlib
+from elftools.elf.elffile import ELFFile
+
+
+def usage(exit_code):
+    print("usage:")
+    print(sys.argv[0] + " --arc-id 0x52 --image u-boot.bin --elf u-boot")
+    sys.exit(exit_code)
+
+
+def elf_get_entry(filename):
+    with open(filename, 'rb') as f:
+        elffile = ELFFile(f)
+        return elffile.header['e_entry']
+
+
+def calc_check_sum(filename):
+    # u-boot.head check_sum for preloader - it is sum of all u-boot binary bytes
+    with open(filename, "rb") as file:
+        ba = bytearray(file.read())
+    return sum(ba) & 0xFF
+
+
+def arg_verify(uboot_bin_filename, uboot_elf_filename, arc_id):
+    if arc_id not in [0x52, 0x53]:
+        print("unknown ARC ID: " + hex(arc_id))
+        sys.exit(2)
+
+    if not os.path.isfile(uboot_bin_filename):
+        print("uboot bin file not exists: " + uboot_bin_filename)
+        sys.exit(2)
+
+    if not os.path.isfile(uboot_elf_filename):
+        print("uboot elf file not exists: " + uboot_elf_filename)
+        sys.exit(2)
+
+
+def main():
+    try:
+        opts, args = getopt.getopt(sys.argv[1:],
+            "ha:i:l:e:", ["help", "arc-id=", "image=", "elf="])
+    except getopt.GetoptError as err:
+        print(err)
+        usage(2)
+
+    # default filenames
+    uboot_elf_filename  = "u-boot"
+    uboot_bin_filename  = "u-boot.bin"
+    headerised_filename = "u-boot.head"
+    uboot_scrypt_file   = "u-boot-update.txt"
+
+    # initial header values: place where preloader will store u-boot binary,
+    # should be equal to CONFIG_SYS_TEXT_BASE
+    image_copy_adr  = 0x81000000
+
+    # initial constant header values, do not change these values
+    arc_id          = 0x52         # 0x52 for 1st HSDK release (hardcoded in RTL)
+    magic1          = 0xdeadbeafaf # big endian byte order
+    flash_address   = 0x0
+    flash_type      = 0x0          # 0 - SPI flash, 1 - NOR flash
+    magic2          = [            # big endian byte order
+    0x20202a2020202020202020202a20202020207c5c2e20202020202e2f7c20202020207c2d,
+    0x2e5c2020202f2e2d7c20202020205c2020602d2d2d6020202f20202020202f205f202020,
+    0x205f20205c20202020207c205f60712070205f207c2020202020272e5f3d2f205c3d5f2e,
+    0x272020202020202020605c202f60202020202020202020202020206f2020202020202020]
+
+    for opt, arg in opts:
+        if opt in ('-h', "--help"):   usage(0)
+        if opt in ('-a', "--arc-id"): arc_id             = int(arg, 16)
+        if opt in ('-i', "--image"):  uboot_bin_filename = arg
+        if opt in ('-e', "--elf"):    uboot_elf_filename = arg
+
+    arg_verify(uboot_bin_filename, uboot_elf_filename, arc_id)
+
+    uboot_img_size = os.path.getsize(uboot_bin_filename)
+    jump_address = elf_get_entry(uboot_elf_filename)
+    check_sum = calc_check_sum(uboot_bin_filename)
+
+    # write header to file
+    with open(headerised_filename, "wb") as file:
+        file.write(arc_id.to_bytes(2, byteorder='little'))
+        file.write(uboot_img_size.to_bytes(4, byteorder='little'))
+        file.write(check_sum.to_bytes(1, byteorder='little'))
+        file.write(image_copy_adr.to_bytes(4, byteorder='little'))
+        file.write(magic1.to_bytes(5, byteorder='big'))
+        file.write(jump_address.to_bytes(4, byteorder='little'))
+        for i in range(12): file.write(0xFF.to_bytes(1, byteorder='little'))
+        for byte in magic2: file.write(byte.to_bytes(36, byteorder='big'))
+        for i in range(208 - len(magic2) * 36):
+            file.write(0xFF.to_bytes(1, byteorder='little'))
+        file.write(flash_address.to_bytes(4, byteorder='little'))
+        for i in range(11): file.write(0xFF.to_bytes(1, byteorder='little'))
+        file.write(flash_type.to_bytes(1, byteorder='little'))
+
+    # append u-boot image to header
+    with open(headerised_filename, "ab") as fo:
+        with open(uboot_bin_filename,'rb') as fi:
+            fo.write(fi.read())
+
+    # calc u-boot headerized image CRC32 (will be used by uboot update
+    # command for check)
+    headerised_image_crc = ""
+    with open(headerised_filename, "rb") as fi:
+        headerised_image_crc = hex(zlib.crc32(fi.read()) & 0xffffffff)
+
+    load_addr = 0x81000000
+    crc_store_adr = load_addr - 0x8
+    crc_calc_adr = crc_store_adr - 0x4
+    load_size = os.path.getsize(headerised_filename)
+    crc_calc_cmd = \
+        "crc32 " + hex(load_addr) + " " + hex(load_size) + " " + hex(crc_calc_adr)
+    crc_check_cmd = \
+        "mw.l " + hex(crc_store_adr) + " " + headerised_image_crc + " && " + \
+        crc_calc_cmd + " && " + \
+        "cmp.l " + hex(crc_store_adr) + " " + hex(crc_calc_adr) + " 1"
+
+    # make errase size to be allighned by 64K
+    if load_size & 0xFFFF == 0:
+        errase_size = load_size
+    else:
+        errase_size = load_size - (load_size & 0xFFFF) + 0x10000
+
+    # u-bood CMD to load u-bood with header to SPI flash
+    sf_load_image_cmd = \
+        "fatload mmc 0:1 " + hex(load_addr) + " " + headerised_filename + " && " + \
+        "sf probe 0:0 && " + \
+        crc_check_cmd + " && " + \
+        "sf protect unlock 0x0 " + hex(errase_size) + " && " + \
+        "sf erase 0x0 " + hex(errase_size) + " && " + \
+        "sf write " + hex(load_addr) + " 0x0 " + hex(load_size) + " && " + \
+        "sf protect lock 0x0 " + hex(errase_size)
+
+    update_uboot_cmd = sf_load_image_cmd + " && echo \"u-boot update: OK\""
+
+    with open(uboot_scrypt_file, "wb") as fo:
+        fo.write(update_uboot_cmd.encode('ascii'))
+
+
+if __name__ == "__main__":
+    try:
+        main()
+    except Exception as err:
+        print(err)
+        sys.exit(2)