mx6: Add board mx6memcal for use in validating DDR

This is a virtual "board" that uses configuration files and
Kconfig to define the memory layout used by a real board during
the board bring-up process.

It generates an SPL image that can be loaded using imx_usb or
SB_LOADER.exe.

When run, it will generate a set of calibration constants for
use in either or both a DCD configuration file for boards that
use u-boot.imx or struct mx6_mmdc_calibration for boards that
boot via SPL.

In essence, it is a configurable, open-source variant of the
Freescale ddr-stress tool.

	https://community.nxp.com/docs/DOC-105652

File mx6memcal_defconfig configures the board for use with
mx6sabresd or mx6qsabreauto.

Signed-off-by: Eric Nelson <eric@nelint.com>
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>

6 files changed, 792 insertions, 0 deletions

diff --git a/board/freescale/mx6memcal/Kconfig b/board/freescale/mx6memcal/Kconfig
new file mode 100644
index 0000000000..443804dc11
--- /dev/null
+++ b/board/freescale/mx6memcal/Kconfig
@@ -0,0 +1,235 @@
+if TARGET_MX6MEMCAL
+
+config SYS_BOARD
+	default "mx6memcal"
+
+config SYS_VENDOR
+	default "freescale"
+
+config SYS_CONFIG_NAME
+	default "mx6memcal"
+
+menu "mx6memcal specifics"
+choice
+	prompt "Serial console"
+	help
+	  Either UART1 or UART2 will be used as the console for
+	  displaying the calibration values or errors.
+
+config SERIAL_CONSOLE_UART1
+	bool "UART1"
+	help
+	  Select this if your board uses UART1 for its' console.
+
+config SERIAL_CONSOLE_UART2
+	bool "UART2"
+	help
+	  Select this if your board uses UART2 for its' console.
+
+endchoice
+
+choice
+	prompt "UART pads"
+	help
+	  Select the RX and TX pads used for your serial console.
+	  The choices below reflect the most commonly used options
+	  for your UART.
+
+	config UART2_EIM_D26_27
+		bool "UART2 on EIM_D26/27 (SabreLite, Nitrogen6x)"
+		depends on SERIAL_CONSOLE_UART2
+		help
+		  Choose this configuration if you're using pads
+		  EIM_D26 and D27 for a console on UART2.
+		  This is typical for designs that are based on the
+		  NXP SABRELite.
+
+	config UART1_CSI0_DAT10_11
+		bool "UART1 on CSI0_DAT10/11 (Wand)"
+		depends on SERIAL_CONSOLE_UART1
+		help
+		  Choose this configuration if you're using pads
+		  CSI0_DAT10 and DAT11 for a console on UART1 as
+		  is done on the i.MX6 Wand board.
+
+	config UART1_SD3_DAT6_7
+		bool "UART1 on SD3_DAT6/7 (SabreSD, SabreAuto)"
+		depends on SERIAL_CONSOLE_UART1
+		help
+		  Choose this configuration if you're using pads
+		  SD3_DAT6 and DAT7 for a console on UART1 as is
+		  done on the NXP SABRESD or SABREAUTO designs.
+
+	config UART1_UART1
+		bool "UART1 on UART1 (i.MX6SL EVK, WaRP)"
+		depends on SERIAL_CONSOLE_UART1
+		help
+		  Choose this configuration if you're using pads
+		  UART1_TXD/RXD for a console on UART1 as is done
+		  on most i.MX6SL designs.
+
+endchoice
+
+config IMXIMAGE_OUTPUT
+	bool "Include output for imximage .cfg files"
+	default y
+	help
+	  Say "Y" if you want output formatted for use in non-SPL
+	  (DCD-style) configuration files.
+
+config DDRWIDTH
+	int "DDR bus width"
+	default 64
+	help
+	  Select either 32 or 64 to reflect the DDR bus width.
+
+config DDRCS
+	int "DDR chip selects"
+	default 2
+	range 1 2
+	help
+	  Select the number of chip selects used in your board design
+
+choice
+	prompt "Memory type"
+	help
+	  Select the type of DDR (DDR3 or LPDDR2) used on your design
+
+config	DDR3
+	bool "DDR3"
+	help
+	  Select this if your board design uses DDR3.
+
+config	LPDDR2
+	bool "LPDDR2"
+	help
+	  Select this if your board design uses LPDDR2.
+
+endchoice
+
+choice
+	prompt "Memory device"
+
+config MT41K512M16TNA
+	bool "Micron MT41K512M16TNA 512Mx16 (1GiB/chip)"
+	depends on DDR3
+
+config MT41K128M16JT
+	bool "Micron MT41K128M16JT 128Mx16 (256 MiB/chip)"
+	depends on DDR3
+
+config H5TQ4G63AFR
+	bool "Hynix H5TQ4G63AFR 256Mx16 (512 MiB/chip)"
+	depends on DDR3
+
+config H5TQ2G63DFR
+	bool "Hynix H5TQ2G63DFR 128Mx16 (256 MiB/chip)"
+	depends on DDR3
+
+config MT42L256M32D2LG
+	bool "Micron MT42L256M32D2LG LPDDR2 256Mx32 (1GiB/chip)"
+	depends on LPDDR2
+
+config MT29PZZZ4D4BKESK
+	bool "Micron MT29PZZZ4D4BKESK multi-chip 512MiB LPDDR2/4GiB eMMC"
+	depends on LPDDR2
+
+endchoice
+
+config DDR_ODT
+	int "DDR On-die-termination"
+	default 2
+	range 0 7
+	help
+	  Enter the on-die termination value as an index defined for
+	  IOMUX settings for PAD_DRAM_SDCLK0_P and others.
+	  0 == Disabled
+	  1 == 120 Ohm
+	  2 == 60 Ohm
+	  3 == 40 Ohm
+	  4 == 30 Ohm
+	  5 == 24 Ohm
+	  6 == 20 Ohm
+	  7 == 17 Ohm
+	  Value will be applied to all clock and data lines
+
+
+config DRAM_DRIVE_STRENGTH
+	int "DRAM Drive strength"
+	default 6
+	range 0 7
+	help
+	  Enter drive strength as an index defined for IOMUX settings
+	  for GRP_B1DS and others.
+	  0 == Hi Z
+	  6 == 40 Ohm (default)
+	  7 == 34 Ohm
+	  Value will be applied to all clock and data lines
+
+config RTT_NOM
+	int "RTT_NOM"
+	default 1
+	range 1 2
+	help
+	  Enter the RTT_NOM selector
+	  1 == RZQ/4 (60ohm)
+	  2 == RZQ/2 (120ohm)
+
+config RTT_WR
+	int "RTT_WR"
+	default 1
+	range 0 2
+	help
+	  Enter the RTT_WR selector for MR2
+	  0 == Dynamic ODT disabled
+	  1 == RZQ/4 (60ohm)
+	  2 == RZQ/2 (120ohm)
+
+config RALAT
+	int "Read additional latency"
+	default 5
+	range 0 7
+	help
+	  Enter a latency in number of cycles. This will be added to
+	  CAS and internal delays for which the MMDC will retrieve the
+	  read data from the internal FIFO.
+	  This is used to compensate for board/chip delays.
+
+config WALAT
+	int "Write additional latency"
+	default 0
+	range 0 7
+	help
+	  Enter a latency in number of cycles. This will be added to
+	  CAS and internal delays for which the MMDC will retrieve the
+	  read data from the internal FIFO
+	  This is used to compensate for board/chip delays.
+
+config REFSEL
+	int "Refresh period"
+	range 0 3
+	default 1
+	help
+	  Select the DDR refresh period.
+	  See the description of bitfield REF_SEL in the reference manual
+	  for details.
+	  0 == disabled
+	  1 == 32 kHz
+	  2 == 64 kHz
+	  3 == fast counter
+
+config REFR
+	int "Number of refreshes"
+	range 0 7
+	default 7
+	help
+	   This selects the number of refreshes (-1) during each period.
+	   i.e.:
+	   0 == 1 refresh (tRFC)
+	   7 == 8 refreshes (tRFC*8)
+	   See the description of MDREF[REFR] in the reference manual for
+	   details.
+
+endmenu
+endif
+
diff --git a/board/freescale/mx6memcal/MAINTAINERS b/board/freescale/mx6memcal/MAINTAINERS
new file mode 100644
index 0000000000..5da38f7109
--- /dev/null
+++ b/board/freescale/mx6memcal/MAINTAINERS
@@ -0,0 +1,7 @@
+MX6MEMCAL BOARD
+M:	Eric Nelson <eric@nelint.com>
+S:	Maintained
+F:	board/freescale/mx6memcal/
+F:	include/configs/mx6memcal.h
+F:	configs/mx6memcal_defconfig
+
diff --git a/board/freescale/mx6memcal/Makefile b/board/freescale/mx6memcal/Makefile
new file mode 100644
index 0000000000..2d7a6fa5d9
--- /dev/null
+++ b/board/freescale/mx6memcal/Makefile
@@ -0,0 +1,13 @@
+#
+# Copyright (C) 2007, Guennadi Liakhovetski <lg@denx.de>
+#
+# (C) Copyright 2011 Freescale Semiconductor, Inc.
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+ifdef CONFIG_SPL_BUILD
+obj-y	:= spl.o
+else
+obj-y	:= mx6memcal.o
+endif
diff --git a/board/freescale/mx6memcal/README b/board/freescale/mx6memcal/README
new file mode 100644
index 0000000000..9fe2fe2d04
--- /dev/null
+++ b/board/freescale/mx6memcal/README
@@ -0,0 +1,49 @@
+mx6memcal - a tool for calibrating DDR on i.MX6 boards.
+
+The mx6memcal board isn't a real board, but a tool for use in bring-up of
+new i.MX6 board designs.
+
+It provides a similar function to the tool from NXP([1]) with a number
+of advantages:
+
+1. It's open-source, so it's easier to change if needed.
+   Typical reasons for needing to change include the use of alternate
+   UARTs and PMIC initialization.
+2. It produces an image that's directly loadable with imx_usb [2] or
+   SB_LOADER.exe [3].
+   The NXP tool requires either a cumbersome JTAG connection that
+   makes running the DDR very slow or a working U-Boot image that
+   suffers from a chicken-and-egg problem (i.e. where do you get the
+   DDR parameters for U-Boot?).
+3. It doesn't prompt for parameters, so it's much faster to gather
+   data from multiple boards.
+4. Parameters to the calibration process can be chosen through
+   'make menuconfig'.
+
+When booted, the mx6memcal board will run the DDR calibration
+routines and display the result in a form suitable for cut and
+paste into struct mx6_mmdc_calibration. It can also optionally
+produce output in a form usable in a DCD-style .cfg file.
+
+Selections in Kconfig allow most system design settings to be chosen:
+
+1. The UART number and pad configuration for the UART. Options
+   include support for the most frequent reference designs on
+   i.MX6DQ/SDL (SABRE Lite and SABRESD designs).
+2. The memory bus width (64 and 32-bit)
+3. The number of chip-selects in use
+4. The type of DDR (DDR3 or LPDDR2). Note that LPDDR2 support
+   is incomplete as of this writing.
+5. The type of DDR chips in use. This selection allows re-use of common
+   parts and four DDR3 and two LPDDR2 parts are currently defined
+6. The On-die termination value for the DRAM lines
+7. The DRAM drive strength
+8. The RTT_NOM and RTT_WR termination settings
+9. RALAT/WALAT latency values
+
+References:
+[1] - NXP DDR Stress Test Tool - https://community.nxp.com/docs/DOC-105652
+[2] - Boundary Devices imx_usb_loader
+      https://github.com/boundarydevices/imx_usb_loader
+[3] - Use of SB_Loader.exe
+      https://boundarydevices.com/windows-users-and-unbricking
diff --git a/board/freescale/mx6memcal/mx6memcal.c b/board/freescale/mx6memcal/mx6memcal.c
new file mode 100644
index 0000000000..afea0fbd9d
--- /dev/null
+++ b/board/freescale/mx6memcal/mx6memcal.c
@@ -0,0 +1,32 @@
+/*
+ * mx6memcal board support - provides a minimal, UART-only
+ * U-Boot that's capable of running a memory test.
+ *
+ * Copyright (C) 2016 Nelson Integration, LLC
+ * Author: Eric Nelson <eric@nelint.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/arch/sys_proto.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int board_init(void)
+{
+	return 0;
+}
+
+int checkboard(void)
+{
+	puts("Board: mx6memcal\n");
+	return 0;
+}
+
+int dram_init(void)
+{
+	gd->ram_size = imx_ddr_size();
+	return 0;
+}
+
diff --git a/board/freescale/mx6memcal/spl.c b/board/freescale/mx6memcal/spl.c
new file mode 100644
index 0000000000..8ee89ff116
--- /dev/null
+++ b/board/freescale/mx6memcal/spl.c
@@ -0,0 +1,456 @@
+/*
+ * Copyright (C) 2016 Nelson Integration, LLC
+ * Author: Eric Nelson <eric@nelint.com>
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/iomux.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/crm_regs.h>
+#include <asm/arch/mx6-ddr.h>
+#include <asm/arch/mx6-pins.h>
+#include <asm/arch/sys_proto.h>
+#include <spl.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define UART_PAD_CTRL  (PAD_CTL_PUS_100K_UP |			\
+	PAD_CTL_SPEED_MED | PAD_CTL_DSE_40ohm |			\
+	PAD_CTL_SRE_FAST  | PAD_CTL_HYS)
+
+static iomux_v3_cfg_t const uart_pads[] = {
+#ifdef CONFIG_UART2_EIM_D26_27
+	IOMUX_PADS(PAD_EIM_D26__UART2_TX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL)),
+	IOMUX_PADS(PAD_EIM_D27__UART2_RX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL)),
+#elif defined(CONFIG_UART1_CSI0_DAT10_11)
+	IOMUX_PADS(PAD_CSI0_DAT10__UART1_TX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL)),
+	IOMUX_PADS(PAD_CSI0_DAT11__UART1_RX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL)),
+#elif defined(CONFIG_UART1_SD3_DAT6_7)
+	IOMUX_PADS(PAD_SD3_DAT6__UART1_RX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL)),
+	IOMUX_PADS(PAD_SD3_DAT7__UART1_TX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL)),
+#elif defined(CONFIG_UART1_UART1)
+	MX6_PAD_UART1_TXD__UART1_TXD | MUX_PAD_CTRL(UART_PAD_CTRL),
+	MX6_PAD_UART1_RXD__UART1_RXD | MUX_PAD_CTRL(UART_PAD_CTRL),
+#else
+#error select UART console pads
+#endif
+};
+
+#ifdef CONFIG_DDR3
+#define GRP_DDRTYPE	0x000C0000
+#else
+#define GRP_DDRTYPE	0x00080000
+#endif
+
+/* all existing designs have this disabled */
+#define DDR_PKE		0
+
+/* use Kconfig for ODT and DRIVE_STRENGTH */
+#define DDR_ODT	\
+	(CONFIG_DDR_ODT << 8)
+#define DRAM_DRIVE_STRENGTH \
+	(CONFIG_DRAM_DRIVE_STRENGTH << 3)
+
+/* configure MX6Q/DUAL mmdc DDR io registers */
+static struct mx6dq_iomux_ddr_regs const mx6dq_ddr_ioregs = {
+	/* SDCLK[0:1], CAS, RAS, Reset: Differential input, 40ohm */
+	.dram_sdclk_0 = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_sdclk_1 = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_cas = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_ras = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_reset = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	/* SDCKE[0:1]: 100k pull-up */
+	.dram_sdcke0 = 0x00003000,
+	.dram_sdcke1 = 0x00003000,
+	/* SDBA2: pull-up disabled */
+	.dram_sdba2 = 0x00000000,
+	/* SDODT[0:1]: 100k pull-up, 40 ohm */
+	.dram_sdodt0 = 0x00003000 + DRAM_DRIVE_STRENGTH,
+	.dram_sdodt1 = 0x00003000 + DRAM_DRIVE_STRENGTH,
+	/* SDQS[0:7]: Differential input, 40 ohm */
+	.dram_sdqs0 = DRAM_DRIVE_STRENGTH,
+	.dram_sdqs1 = DRAM_DRIVE_STRENGTH,
+	.dram_sdqs2 = DRAM_DRIVE_STRENGTH,
+	.dram_sdqs3 = DRAM_DRIVE_STRENGTH,
+	.dram_sdqs4 = DRAM_DRIVE_STRENGTH,
+	.dram_sdqs5 = DRAM_DRIVE_STRENGTH,
+	.dram_sdqs6 = DRAM_DRIVE_STRENGTH,
+	.dram_sdqs7 = DRAM_DRIVE_STRENGTH,
+
+	/* DQM[0:7]: Differential input, 40 ohm */
+	.dram_dqm0 = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_dqm1 = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_dqm2 = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_dqm3 = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_dqm4 = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_dqm5 = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_dqm6 = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_dqm7 = DDR_ODT + DRAM_DRIVE_STRENGTH,
+};
+
+/* configure MX6Q/DUAL mmdc GRP io registers */
+static struct mx6dq_iomux_grp_regs const mx6dq_grp_ioregs = {
+	/* DDR3 */
+	.grp_ddr_type = GRP_DDRTYPE,
+	.grp_ddrmode_ctl = DDR_ODT,
+	/* disable DDR pullups */
+	.grp_ddrpke = DDR_PKE,
+	/* ADDR[00:16], SDBA[0:1]: 40 ohm */
+	.grp_addds = DRAM_DRIVE_STRENGTH,
+	/* CS0/CS1/SDBA2/CKE0/CKE1/SDWE: 40 ohm */
+	.grp_ctlds = DRAM_DRIVE_STRENGTH,
+	/* DATA[00:63]: Differential input, 40 ohm */
+	.grp_ddrmode = DDR_ODT,
+	.grp_b0ds = DRAM_DRIVE_STRENGTH,
+	.grp_b1ds = DRAM_DRIVE_STRENGTH,
+	.grp_b2ds = DRAM_DRIVE_STRENGTH,
+	.grp_b3ds = DRAM_DRIVE_STRENGTH,
+	.grp_b4ds = DRAM_DRIVE_STRENGTH,
+	.grp_b5ds = DRAM_DRIVE_STRENGTH,
+	.grp_b6ds = DRAM_DRIVE_STRENGTH,
+	.grp_b7ds = DRAM_DRIVE_STRENGTH,
+};
+
+static struct mx6sdl_iomux_ddr_regs const mx6sdl_ddr_ioregs = {
+	/* SDCLK[0:1], CAS, RAS, Reset: Differential input, 40ohm */
+	.dram_sdclk_0 = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_sdclk_1 = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_cas = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_ras = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_reset = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	/* SDCKE[0:1]: 100k pull-up */
+	.dram_sdcke0 = 0x00003000,
+	.dram_sdcke1 = 0x00003000,
+	/* SDBA2: pull-up disabled */
+	.dram_sdba2 = 0x00000000,
+	/* SDODT[0:1]: 100k pull-up, 40 ohm */
+	.dram_sdodt0 = 0x00003000 + DRAM_DRIVE_STRENGTH,
+	.dram_sdodt1 = 0x00003000 + DRAM_DRIVE_STRENGTH,
+	/* SDQS[0:7]: Differential input, 40 ohm */
+	.dram_sdqs0 = DRAM_DRIVE_STRENGTH,
+	.dram_sdqs1 = DRAM_DRIVE_STRENGTH,
+	.dram_sdqs2 = DRAM_DRIVE_STRENGTH,
+	.dram_sdqs3 = DRAM_DRIVE_STRENGTH,
+	.dram_sdqs4 = DRAM_DRIVE_STRENGTH,
+	.dram_sdqs5 = DRAM_DRIVE_STRENGTH,
+	.dram_sdqs6 = DRAM_DRIVE_STRENGTH,
+	.dram_sdqs7 = DRAM_DRIVE_STRENGTH,
+
+	/* DQM[0:7]: Differential input, 40 ohm */
+	.dram_dqm0 = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_dqm1 = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_dqm2 = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_dqm3 = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_dqm4 = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_dqm5 = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_dqm6 = DDR_ODT + DRAM_DRIVE_STRENGTH,
+	.dram_dqm7 = DDR_ODT + DRAM_DRIVE_STRENGTH,
+};
+
+/* configure MX6SOLO/DUALLITE mmdc GRP io registers */
+static struct mx6sdl_iomux_grp_regs const mx6sdl_grp_ioregs = {
+	/* DDR3 */
+	.grp_ddr_type = GRP_DDRTYPE,
+	/* SDQS[0:7]: Differential input, 40 ohm */
+	.grp_ddrmode_ctl = DDR_ODT,
+	/* disable DDR pullups */
+	.grp_ddrpke = DDR_PKE,
+	/* ADDR[00:16], SDBA[0:1]: 40 ohm */
+	.grp_addds = DRAM_DRIVE_STRENGTH,
+	/* CS0/CS1/SDBA2/CKE0/CKE1/SDWE: 40 ohm */
+	.grp_ctlds = DRAM_DRIVE_STRENGTH,
+	/* DATA[00:63]: Differential input, 40 ohm */
+	.grp_ddrmode = DDR_ODT,
+	.grp_b0ds = DRAM_DRIVE_STRENGTH,
+	.grp_b1ds = DRAM_DRIVE_STRENGTH,
+	.grp_b2ds = DRAM_DRIVE_STRENGTH,
+	.grp_b3ds = DRAM_DRIVE_STRENGTH,
+	.grp_b4ds = DRAM_DRIVE_STRENGTH,
+	.grp_b5ds = DRAM_DRIVE_STRENGTH,
+	.grp_b6ds = DRAM_DRIVE_STRENGTH,
+	.grp_b7ds = DRAM_DRIVE_STRENGTH,
+};
+
+const struct mx6sl_iomux_ddr_regs mx6sl_ddr_ioregs = {
+	.dram_sdqs0 = DRAM_DRIVE_STRENGTH,
+	.dram_sdqs1 = DRAM_DRIVE_STRENGTH,
+	.dram_sdqs2 = DRAM_DRIVE_STRENGTH,
+	.dram_sdqs3 = DRAM_DRIVE_STRENGTH,
+	.dram_dqm0 = DRAM_DRIVE_STRENGTH,
+	.dram_dqm1 = DRAM_DRIVE_STRENGTH,
+	.dram_dqm2 = DRAM_DRIVE_STRENGTH,
+	.dram_dqm3 = DRAM_DRIVE_STRENGTH,
+	.dram_cas  = DRAM_DRIVE_STRENGTH,
+	.dram_ras  = DRAM_DRIVE_STRENGTH,
+	.dram_sdclk_0 = DRAM_DRIVE_STRENGTH,
+	.dram_reset = DRAM_DRIVE_STRENGTH,
+	.dram_sdba2 = 0x00020000,
+	.dram_odt0 = 0x00030000 + DRAM_DRIVE_STRENGTH,
+	.dram_odt1 = 0x00030000 + DRAM_DRIVE_STRENGTH,
+};
+
+const struct mx6sl_iomux_grp_regs mx6sl_grp_ioregs = {
+	.grp_b0ds = DRAM_DRIVE_STRENGTH,
+	.grp_b1ds = DRAM_DRIVE_STRENGTH,
+	.grp_b2ds = DRAM_DRIVE_STRENGTH,
+	.grp_b3ds = DRAM_DRIVE_STRENGTH,
+	.grp_addds = DRAM_DRIVE_STRENGTH,
+	.grp_ctlds = DRAM_DRIVE_STRENGTH,
+	.grp_ddrmode_ctl = DDR_ODT,
+	.grp_ddrpke = DDR_PKE,
+	.grp_ddrmode = DDR_ODT,
+	.grp_ddr_type = GRP_DDRTYPE,
+};
+
+static struct mx6_ddr_sysinfo const sysinfo = {
+	/* width of data bus:0=16,1=32,2=64 */
+#if CONFIG_DDRWIDTH == 32
+	.dsize = 1,
+#elif CONFIG_DDRWIDTH == 64
+	.dsize = 2,
+#else
+#error missing CONFIG_DDRWIDTH
+#endif
+	/* config for full 4GB range so that get_mem_size() works */
+	.cs_density = 32, /* 32Gb per CS */
+
+	/* # of chip selects */
+	.ncs = CONFIG_DDRCS,
+	.cs1_mirror = 0,
+	.bi_on = 1,	/* Bank interleaving enabled */
+	.rtt_nom = CONFIG_RTT_NOM,
+	.rtt_wr = CONFIG_RTT_WR,
+	.ralat = CONFIG_RALAT,	/* Read additional latency */
+	.walat = CONFIG_WALAT,	/* Write additional latency */
+	.mif3_mode = 3,	/* Command prediction working mode */
+#ifdef CONFIG_DDR3
+	.rst_to_cke = 0x23,	/* 33 cycles, 500us (JEDEC default) */
+	.sde_to_rst = 0x10,	/* JEDEC value for LPDDR2 - 200us */
+	.pd_fast_exit = 0,	/* immaterial for calibration */
+	.ddr_type = DDR_TYPE_DDR3,
+#else
+	.rst_to_cke = 0x10,	/* JEDEC value for LPDDR2: 200us */
+	.sde_to_rst = 0,	/* LPDDR2 does not need this field */
+	.pd_fast_exit = 0,	/* immaterial for calibration */
+	.ddr_type = DDR_TYPE_LPDDR2,
+#endif
+	.refsel = CONFIG_REFSEL,
+	.refr = CONFIG_REFR,
+};
+
+#ifdef CONFIG_MT41K512M16TNA
+/* Micron MT41K512M16TNA-125 */
+static struct mx6_ddr3_cfg const ddrtype = {
+	.mem_speed = 1600,
+	.density = 8,
+	.width = 16,
+	.banks = 8,
+	.rowaddr = 15,
+	.coladdr = 10,
+	.pagesz = 1,
+	.trcd = 1375,
+	.trcmin = 5062,
+	.trasmin = 3750,
+};
+#elif defined(CONFIG_MT41K128M16JT)
+/* Micron MT41K128M16JT-125 */
+static struct mx6_ddr3_cfg const ddrtype = {
+	.mem_speed = 1600,
+	.density = 2,
+	.width = 16,
+	.banks = 8,
+	.rowaddr = 14,
+	.coladdr = 10,
+	.pagesz = 2,
+	.trcd = 1375,
+	.trcmin = 4875,
+	.trasmin = 3500,
+};
+#elif defined(CONFIG_H5TQ4G63AFR)
+/* Hynix H5TQ4G63AFR */
+static struct mx6_ddr3_cfg const ddrtype = {
+	.mem_speed = 1600,
+	.density = 4,
+	.width = 16,
+	.banks = 8,
+	.rowaddr = 15,
+	.coladdr = 10,
+	.pagesz = 2,
+	.trcd = 1375,
+	.trcmin = 4875,
+	.trasmin = 3500,
+};
+#elif defined CONFIG_H5TQ2G63DFR
+/* Hynix H5TQ2G63DFR */
+static struct mx6_ddr3_cfg const ddrtype = {
+	.mem_speed = 1333,
+	.density = 2,
+	.width = 16,
+	.banks = 8,
+	.rowaddr = 14,
+	.coladdr = 10,
+	.pagesz = 2,
+	.trcd = 1350,
+	.trcmin = 4950,
+	.trasmin = 3600,
+};
+#elif defined(CONFIG_MT42L256M32D2LG)
+/* Micron MT42L256M32D2LG */
+static struct mx6_lpddr2_cfg ddrtype = {
+	.mem_speed = 800,
+	.density = 4,
+	.width = 32,
+	.banks = 8,
+	.rowaddr = 14,
+	.coladdr = 10,
+	.trcd_lp = 2000,
+	.trppb_lp = 2000,
+	.trpab_lp = 2250,
+	.trasmin = 4200,
+};
+#elif defined(CONFIG_MT29PZZZ4D4BKESK)
+/* Micron MT29PZZZ4D4BKESK */
+static struct mx6_lpddr2_cfg ddrtype = {
+	.mem_speed = 800,
+	.density = 4,
+	.width = 32,
+	.banks = 8,
+	.rowaddr = 14,
+	.coladdr = 10,
+	.trcd_lp = 2000,
+	.trppb_lp = 2000,
+	.trpab_lp = 2250,
+	.trasmin = 4200,
+};
+#else
+#error please select DDR type using menuconfig
+#endif
+
+static void ccgr_init(void)
+{
+	struct mxc_ccm_reg *ccm = (struct mxc_ccm_reg *)CCM_BASE_ADDR;
+
+	/* FIXME: these should probably be checked, especially
+	 * for i.MX6SL, UL, ULL
+	 */
+	writel(0x00C03F3F, &ccm->CCGR0);
+	writel(0x0030FC03, &ccm->CCGR1);
+	writel(0x0FFFC000, &ccm->CCGR2);
+	writel(0x3FF00000, &ccm->CCGR3);
+	writel(0x00FFF300, &ccm->CCGR4);
+	writel(0x0F0000C3, &ccm->CCGR5);
+	writel(0x000003FF, &ccm->CCGR6);
+}
+
+static void display_calibration(struct mx6_mmdc_calibration *calib)
+{
+	printf(".p0_mpdgctrl0\t= 0x%08X\n", calib->p0_mpdgctrl0);
+	printf(".p0_mpdgctrl1\t= 0x%08X\n", calib->p0_mpdgctrl1);
+	printf(".p0_mprddlctl\t= 0x%08X\n", calib->p0_mprddlctl);
+	printf(".p0_mpwrdlctl\t= 0x%08X\n", calib->p0_mpwrdlctl);
+	printf(".p0_mpwldectrl0\t= 0x%08X\n", calib->p0_mpwldectrl0);
+	printf(".p0_mpwldectrl1\t= 0x%08X\n", calib->p0_mpwldectrl1);
+	if (sysinfo.dsize == 2) {
+		printf(".p1_mpdgctrl0\t= 0x%08X\n", calib->p1_mpdgctrl0);
+		printf(".p1_mpdgctrl1\t= 0x%08X\n", calib->p1_mpdgctrl1);
+		printf(".p1_mprddlctl\t= 0x%08X\n", calib->p1_mprddlctl);
+		printf(".p1_mpwrdlctl\t= 0x%08X\n", calib->p1_mpwrdlctl);
+		printf(".p1_mpwldectrl0\t= 0x%08X\n", calib->p1_mpwldectrl0);
+		printf(".p1_mpwldectrl1\t= 0x%08X\n", calib->p1_mpwldectrl1);
+	}
+#ifdef CONFIG_IMXIMAGE_OUTPUT
+	printf("DATA 4 MX6_MMDC_P0_MPDGCTRL0\t= 0x%08X\n", calib->p0_mpdgctrl0);
+	printf("DATA 4 MX6_MMDC_P0_MPDGCTRL1\t= 0x%08X\n", calib->p0_mpdgctrl1);
+	printf("DATA 4 MX6_MMDC_P0_MPRDDLCTL\t= 0x%08X\n", calib->p0_mprddlctl);
+	printf("DATA 4 MX6_MMDC_P0_MPWRDLCTL\t= 0x%08X\n", calib->p0_mpwrdlctl);
+	printf("DATA 4 MX6_MMDC_P0_MPWLDECTRL0\t= 0x%08X\n",
+	       calib->p0_mpwldectrl0);
+	printf("DATA 4 MX6_MMDC_P0_MPWLDECTRL1\t= 0x%08X\n",
+	       calib->p0_mpwldectrl1);
+	if (sysinfo.dsize == 2) {
+		printf("DATA 4 MX6_MMDC_P1_MPDGCTRL0\t= 0x%08X\n",
+		       calib->p1_mpdgctrl0);
+		printf("DATA 4 MX6_MMDC_P1_MPDGCTRL1\t= 0x%08X\n",
+		       calib->p1_mpdgctrl1);
+		printf("DATA 4 MX6_MMDC_P1_MPRDDLCTL\t= 0x%08X\n",
+		       calib->p1_mprddlctl);
+		printf("DATA 4 MX6_MMDC_P1_MPWRDLCTL\t= 0x%08X\n",
+		       calib->p1_mpwrdlctl);
+		printf("DATA 4 MX6_MMDC_P1_MPWLDECTRL0\t= 0x%08X\n",
+		       calib->p1_mpwldectrl0);
+		printf("DATA 4 MX6_MMDC_P1_MPWLDECTRL1\t= 0x%08X\n",
+		       calib->p1_mpwldectrl1);
+	}
+#endif
+}
+
+/*
+ * called from C runtime startup code (arch/arm/lib/crt0.S:_main)
+ * - we have a stack and a place to store GD, both in SRAM
+ * - no variable global data is available
+ */
+void board_init_f(ulong dummy)
+{
+	int errs;
+	struct mx6_mmdc_calibration calibration = {0};
+
+	memset((void *)gd, 0, sizeof(struct global_data));
+
+	/* write leveling calibration defaults */
+	calibration.p0_mpwrdlctl = 0x40404040;
+	calibration.p1_mpwrdlctl = 0x40404040;
+
+	/* setup AIPS and disable watchdog */
+	arch_cpu_init();
+
+	ccgr_init();
+
+	SETUP_IOMUX_PADS(uart_pads);
+
+	/* setup GP timer */
+	timer_init();
+
+	/* UART clocks enabled and gd valid - init serial console */
+	preloader_console_init();
+
+	if (sysinfo.dsize != 1) {
+		if (is_cpu_type(MXC_CPU_MX6SX) ||
+		    is_cpu_type(MXC_CPU_MX6UL) ||
+		    is_cpu_type(MXC_CPU_MX6SL)) {
+			printf("cpu type 0x%x doesn't support 64-bit bus\n",
+			       get_cpu_type());
+			reset_cpu(0);
+		}
+	}
+#ifdef CONFIG_MX6SL
+	mx6sl_dram_iocfg(CONFIG_DDRWIDTH, &mx6sl_ddr_ioregs,
+			 &mx6sl_grp_ioregs);
+#else
+	if (is_cpu_type(MXC_CPU_MX6Q)) {
+		mx6dq_dram_iocfg(CONFIG_DDRWIDTH, &mx6dq_ddr_ioregs,
+				 &mx6dq_grp_ioregs);
+	} else {
+		mx6sdl_dram_iocfg(CONFIG_DDRWIDTH, &mx6sdl_ddr_ioregs,
+				  &mx6sdl_grp_ioregs);
+	}
+#endif
+	mx6_dram_cfg(&sysinfo, &calibration, &ddrtype);
+
+	errs = mmdc_do_write_level_calibration(&sysinfo);
+	if (errs) {
+		printf("error %d from write level calibration\n", errs);
+	} else {
+		errs = mmdc_do_dqs_calibration(&sysinfo);
+		if (errs) {
+			printf("error %d from write level calibration\n", errs);
+		} else {
+			printf("completed successfully\n");
+			mmdc_read_calibration(&sysinfo, &calibration);
+			display_calibration(&calibration);
+		}
+	}
+	reset_cpu(0);
+}