diff --git a/doc/README.rockchip b/doc/README.rockchip
index ec10ebb..ca4d647 100644
--- a/doc/README.rockchip
+++ b/doc/README.rockchip
@@ -88,10 +88,92 @@
 
 For example:
 
+1. To build RK3288 board:
+
    CROSS_COMPILE=arm-linux-gnueabi- make O=firefly firefly-rk3288_defconfig all
 
-(or you can use another cross compiler if you prefer)
+    (or you can use another cross compiler if you prefer)
 
+2. To build RK3399 board:
+
+   Option 1: Package the image with Rockchip miniloader:
+
+   - Compile U-Boot
+
+     => cd /path/to/u-boot
+     => make nanopi-neo4-rk3399_defconfig
+     => make
+     => make u-boot.itb
+
+   - Get the rkbin
+
+     => git clone https://github.com/rockchip-linux/rkbin.git
+
+   - Create trust.img
+
+     => cd /path/to/rkbin
+     => ./tools/trust_merger RKTRUST/RK3399TRUST.ini
+
+   - Create uboot.img
+
+     => cd /path/to/rkbin
+     => ./tools/loaderimage --pack --uboot /path/to/u-boot/u-boot-dtb.bin uboot.img
+
+     (Get trust.img and uboot.img)
+
+   Option 2: Package the image with SPL:
+
+   - We need the Python elftools.elf.elffile library for make_fit_atf.py to work
+
+     => sudo apt-get install python-pyelftools
+
+   - Export cross compiler path for aarch64
+
+   - Compile ATF
+
+     For Puma board.
+
+	=> git clone git://git.theobroma-systems.com/arm-trusted-firmware.git
+	=> cd arm-trusted-firmware
+	=> make CROSS_COMPILE=aarch64-linux-gnu- PLAT=rk3399 bl31
+
+	(copy bl31.bin into U-Boot root dir)
+	=> cp build/rk3399/release/bl31/bl31.bin /path/to/u-boot/bl31-rk3399.bin
+
+     For rest of rk3399 boards.
+
+	=> git clone https://github.com/ARM-software/arm-trusted-firmware.git
+	=> cd arm-trusted-firmware
+
+	(export cross compiler path for Cortex-M0 MCU likely arm-none-eabi-)
+	=> make realclean
+	=> make CROSS_COMPILE=aarch64-linux-gnu- PLAT=rk3399
+
+	(copy bl31.elf into U-Boot root dir)
+	=> cp build/rk3399/release/bl31/bl31.elf /path/to/u-boot
+
+   - Compile PMU M0 firmware
+
+     This is optional for most of the rk3399 boards and required only for Puma board.
+
+     => git clone git://git.theobroma-systems.com/rk3399-cortex-m0.git
+     => cd rk3399-cortex-m0
+
+     (export cross compiler path for Cortex-M0 PMU)
+     => make CROSS_COMPILE=arm-cortex_m0-eabi-
+
+     (copy rk3399m0.bin into U-Boot root dir)
+     => cp rk3399m0.bin /path/to/u-boot
+
+   - Compile U-Boot
+
+     => cd /path/to/u-boot
+     => make orangepi-rk3399_defconfig
+     => make
+     => make u-boot.itb
+
+     (Get spl/u-boot-spl-dtb.bin, u-boot.itb images and some boards would get
+      spl/u-boot-spl.bin since it doesn't enable CONFIG_SPL_OF_CONTROL)
 
 Writing to the board with USB
 =============================
@@ -225,6 +307,153 @@
 truncate -s %2048 u-boot.bin
 cat u-boot.bin | split -b 512 --filter='openssl rc4 -K 7C4E0304550509072D2C7B38170D1711' >> out
 
+Booting from an SD card on RK3399
+=================================
+
+To write an image that boots from an SD card (assumed to be /dev/sdc):
+
+Option 1: Package the image with Rockchip miniloader:
+
+  - Create idbloader.img
+
+    => cd /path/to/u-boot
+    => ./tools/mkimage  -n rk3399 -T rksd -d /path/to/rkbin/bin/rk33/rk3399_ddr_800MHz_v1.20.bin idbloader.img
+    => cat /path/to/rkbin/bin/rk33/rk3399_miniloader_v1.19.bin >> idbloader.img
+
+  - Write idbloader.img at 64 sector
+
+    => sudo dd if=idbloader.img of=/dev/sdc seek=64
+
+  - Write trust.img at 24576
+
+    => sudo dd if=trust.img of=/dev/sdc seek=24576
+
+  - Write uboot.img at 16384 sector
+
+    => sudo dd if=uboot.img of=/dev/sdc seek=16384
+    => sync
+
+Put this SD (or micro-SD) card into your board and reset it. You should see
+something like:
+
+DDR Version 1.20 20190314
+In
+Channel 0: DDR3, 933MHz
+Bus Width=32 Col=10 Bank=8 Row=15 CS=1 Die Bus-Width=16 Size=1024MB
+no stride
+ch 0 ddrconfig = 0x101, ddrsize = 0x20
+pmugrf_os_reg[2] = 0x10006281, stride = 0x17
+OUT
+Boot1: 2019-03-14, version: 1.19
+CPUId = 0x0
+ChipType = 0x10, 239
+mmc: ERROR: SDHCI ERR:cmd:0x102,stat:0x18000
+mmc: ERROR: Card did not respond to voltage select!
+emmc reinit
+mmc: ERROR: SDHCI ERR:cmd:0x102,stat:0x18000
+mmc: ERROR: Card did not respond to voltage select!
+emmc reinit
+mmc: ERROR: SDHCI ERR:cmd:0x102,stat:0x18000
+mmc: ERROR: Card did not respond to voltage select!
+SdmmcInit=2 1
+mmc0:cmd5,20
+SdmmcInit=0 0
+BootCapSize=0
+UserCapSize=60543MB
+FwPartOffset=2000 , 0
+StorageInit ok = 45266
+SecureMode = 0
+SecureInit read PBA: 0x4
+SecureInit read PBA: 0x404
+SecureInit read PBA: 0x804
+SecureInit read PBA: 0xc04
+SecureInit read PBA: 0x1004
+SecureInit read PBA: 0x1404
+SecureInit read PBA: 0x1804
+SecureInit read PBA: 0x1c04
+SecureInit ret = 0, SecureMode = 0
+atags_set_bootdev: ret:(0)
+GPT 0x3380ec0 signature is wrong
+recovery gpt...
+GPT 0x3380ec0 signature is wrong
+recovery gpt fail!
+LoadTrust Addr:0x4000
+No find bl30.bin
+Load uboot, ReadLba = 2000
+hdr 0000000003380880 + 0x0:0x88,0x41,0x3e,0x97,0xe6,0x61,0x54,0x23,0xe9,0x5a,0xd1,0x2b,0xdc,0x2f,0xf9,0x35,
+
+Load OK, addr=0x200000, size=0x9c9c0
+RunBL31 0x10000
+NOTICE:  BL31: v1.3(debug):370ab80
+NOTICE:  BL31: Built : 09:23:41, Mar  4 2019
+NOTICE:  BL31: Rockchip release version: v1.1
+INFO:    GICv3 with legacy support detected. ARM GICV3 driver initialized in EL3
+INFO:    Using opteed sec cpu_context!
+INFO:    boot cpu mask: 0
+INFO:    plat_rockchip_pmu_init(1181): pd status 3e
+INFO:    BL31: Initializing runtime services
+INFO:    BL31: Initializing BL32
+INF [0x0] TEE-CORE:init_primary_helper:337: Initializing (1.1.0-195-g8f090d20 #6 Fri Dec  7 06:11:20 UTC 2018 aarch64)
+
+INF [0x0] TEE-CORE:init_primary_helper:338: Release version: 1.2
+
+INF [0x0] TEE-CORE:init_teecore:83: teecore inits done
+INFO:    BL31: Preparing for EL3 exit to normal world
+INFO:    Entry point address = 0x200000
+INFO:    SPSR = 0x3c9
+
+
+U-Boot 2019.04-rc4-00136-gfd121f9641-dirty (Apr 16 2019 - 14:02:47 +0530)
+
+Model: FriendlyARM NanoPi NEO4
+DRAM:  1022 MiB
+MMC:   dwmmc@fe310000: 2, dwmmc@fe320000: 1, sdhci@fe330000: 0
+Loading Environment from MMC... *** Warning - bad CRC, using default environment
+
+In:    serial@ff1a0000
+Out:   serial@ff1a0000
+Err:   serial@ff1a0000
+Model: FriendlyARM NanoPi NEO4
+Net:   eth0: ethernet@fe300000
+Hit any key to stop autoboot:  0
+=>
+
+Option 2: Package the image with SPL:
+
+  - Prefix rk3399 header to SPL image
+
+    => cd /path/to/u-boot
+    => ./tools/mkimage -n rk3399 -T rksd -d spl/u-boot-spl-dtb.bin out
+
+  - Write prefixed SPL at 64th sector
+
+    => sudo dd if=out of=/dev/sdc seek=64
+
+  - Write U-Boot proper at 16384 sector
+
+    => sudo dd if=u-boot.itb of=/dev/sdc seek=16384
+    => sync
+
+Put this SD (or micro-SD) card into your board and reset it. You should see
+something like:
+
+U-Boot SPL board init
+Trying to boot from MMC1
+
+
+U-Boot 2019.01-00004-g14db5ee998 (Mar 11 2019 - 13:18:41 +0530)
+
+Model: Orange Pi RK3399 Board
+DRAM:  2 GiB
+MMC:   dwmmc@fe310000: 2, dwmmc@fe320000: 1, sdhci@fe330000: 0
+Loading Environment from MMC... OK
+In:    serial@ff1a0000
+Out:   serial@ff1a0000
+Err:   serial@ff1a0000
+Model: Orange Pi RK3399 Board
+Net:   eth0: ethernet@fe300000
+Hit any key to stop autoboot:  0
+=>
 
 Using fastboot on rk3288
 ========================
@@ -385,5 +614,7 @@
 http://rockchip.wikidot.com/partitions
 
 --
+Jagan Teki <jagan@amarulasolutions.com>
+27 Mar 2019
 Simon Glass <sjg@chromium.org>
 24 June 2015