U-Boot for UniPhier SoC family
==============================


Recommended toolchains
----------------------

The UniPhier platform is well tested with Linaro toolchains.
You can download pre-built toolchains from:

    http://www.linaro.org/downloads/


Compile the source
------------------

The source can be configured and built with the following commands:

    $ make <defconfig>
    $ make CROSS_COMPILE=<toolchain-prefix> DEVICE_TREE=<device-tree>

The recommended <toolchain-prefix> is `arm-linux-gnueabihf-` for 32bit SoCs,
`aarch64-linux-gnu-` for 64bit SoCs, but you may wish to change it to use your
favorite compiler.

The following tables show <defconfig> and <device-tree> for each board.

32bit SoC boards:

 Board         | <defconfig>                 | <device-tree>
---------------|-----------------------------|------------------------------
LD4 reference  | uniphier_ld4_sld8_defconfig | uniphier-ld4-ref (default)
sld8 reference | uniphier_ld4_sld8_defconfig | uniphier-sld8-def
Pro4 reference | uniphier_v7_defconfig       | uniphier-pro4-ref
Pro4 Ace       | uniphier_v7_defconfig       | uniphier-pro4-ace
Pro4 Sanji     | uniphier_v7_defconfig       | uniphier-pro4-sanji
Pro5 4KBOX     | uniphier_v7_defconfig       | uniphier-pro5-4kbox
PXs2 Gentil    | uniphier_v7_defconfig       | uniphier-pxs2-gentil
PXs2 Vodka     | uniphier_v7_defconfig       | uniphier-pxs2-vodka (default)
LD6b reference | uniphier_v7_defconfig       | uniphier-ld6b-ref

64bit SoC boards:

 Board         | <defconfig>           | <device-tree>
---------------|-----------------------|----------------------------
LD11 reference | uniphier_v8_defconfig | uniphier-ld11-ref
LD11 Global    | uniphier_v8_defconfig | uniphier-ld11-global
LD20 reference | uniphier_v8_defconfig | uniphier-ld20-ref (default)
LD20 Global    | uniphier_v8_defconfig | uniphier-ld20-global
PXs3 reference | uniphier_v8_defconfig | uniphier-pxs3-ref

For example, to compile the source for PXs2 Vodka board, run the following:

    $ make uniphier_v7_defconfig
    $ make CROSS_COMPILE=arm-linux-gnueabihf- DEVICE_TREE=uniphier-pxs2-vodka

The device tree marked as (default) can be omitted.  `uniphier-pxs2-vodka` is
the default device tree for the configuration `uniphier_v7_defconfig`, so the
following gives the same result.

    $ make uniphier_v7_defconfig
    $ make CROSS_COMPILE=arm-linux-gnueabihf-


Booting 32bit SoC boards
------------------------

The build command will generate the following:
- u-boot.bin
- spl/u-boot.bin

U-Boot can boot UniPhier 32bit SoC boards by itself.  Flash the generated images
to the storage device (NAND or eMMC) on your board.

 - spl/u-boot-spl.bin at the offset address 0x00000000
 - u-boot.bin         at the offset address 0x00020000

The `u-boot-with-spl.bin` is the concatenation of the two (with appropriate
padding), so you can also do:

 - u-boot-with-spl.bin at the offset address 0x00000000

If a TFTP server is available, the images can be easily updated.
Just copy the u-boot-spl.bin and u-boot.bin to the TFTP public directory,
and run the following command at the U-Boot command line:

To update the images in NAND:

    => run nandupdate

To update the images in eMMC:

    => run emmcupdate


Booting 64bit SoC boards
------------------------

The build command will generate the following:
- u-boot.bin

However, U-Boot is not the first stage loader for UniPhier 64bit SoC boards.
U-Boot serves as a non-secure boot loader loaded by [ARM Trusted Firmware],
so you need to provide the `u-boot.bin` to the build command of ARM Trusted
Firmware.

[ARM Trusted Firmware]: https://github.com/ARM-software/arm-trusted-firmware


UniPhier specific commands
--------------------------

 - pinmon (enabled by CONFIG_CMD_PINMON)
     shows the boot mode pins that has been latched at the power-on reset

 - ddrphy (enabled by CONFIG_CMD_DDRPHY_DUMP)
     shows the DDR PHY parameters set by the PHY training

 - ddrmphy (enabled by CONFIG_CMD_DDRMPHY_DUMP)
     shows the DDR Multi PHY parameters set by the PHY training


Supported devices
-----------------

 - UART (on-chip)
 - NAND
 - SD/eMMC
 - USB 2.0 (EHCI)
 - USB 3.0 (xHCI)
 - GPIO
 - LAN (on-board SMSC9118)
 - I2C
 - EEPROM (connected to the on-board I2C bus)
 - Support card (SRAM, NOR flash, some peripherals)


Micro Support Card
------------------

The recommended bit switch settings are as follows:

 SW2    OFF(1)/ON(0)   Description
 ------------------------------------------
 bit 1   <----         BKSZ[0]
 bit 2   ---->         BKSZ[1]
 bit 3   <----         SoC Bus Width 16/32
 bit 4   <----         SERIAL_SEL[0]
 bit 5   ---->         SERIAL_SEL[1]
 bit 6   ---->         BOOTSWAP_EN
 bit 7   <----         CS1/CS5
 bit 8   <----         SOC_SERIAL_DISABLE

 SW8    OFF(1)/ON(0)   Description
 ------------------------------------------
 bit 1    <----        CS1_SPLIT
 bit 2    <----        CASE9_ON
 bit 3    <----        CASE10_ON
 bit 4  Don't Care     Reserve
 bit 5  Don't Care     Reserve
 bit 6  Don't Care     Reserve
 bit 7    ---->        BURST_EN
 bit 8    ---->        FLASHBUS32_16

The BKSZ[1:0] specifies the address range of memory slot and peripherals
as follows:

 BKSZ    Description              RAM slot            Peripherals
 --------------------------------------------------------------------
 0b00   15MB RAM / 1MB Peri    00000000-00efffff    00f00000-00ffffff
 0b01   31MB RAM / 1MB Peri    00000000-01efffff    01f00000-01ffffff
 0b10   64MB RAM / 1MB Peri    00000000-03efffff    03f00000-03ffffff
 0b11  127MB RAM / 1MB Peri    00000000-07efffff    07f00000-07ffffff

Set BSKZ[1:0] to 0b01 for U-Boot.
This mode is the most handy because EA[24] is always supported by the save pin
mode of the system bus.  On the other hand, EA[25] is not supported for some
newer SoCs.  Even if it is, EA[25] is not connected on most of the boards.

--
Masahiro Yamada <yamada.masahiro@socionext.com>
Sep. 2017