[PATCH 2/3] MarSBoard: add new board

[Eric Bénard]

this board is produced by Embest/Element 14 and is based on i.MX6 Dual
The following features are tested :
- UART2 (console)
- eMMC
- uSDCard
- Ethernet
- USB Host (through 2 ports hub)
- I2C 1/2
- SPI NOR Flash

Boot on SPI NOR and through USB loader are tested.

For more informations on this board :
http://www.embest-tech.com/shop/star/marsboard.html

Signed-off-by: Eric Bénard <***@eukrea.com>
---
arch/arm/boards/Makefile | 1 +
arch/arm/boards/embest-marsboard/Makefile | 3 +
arch/arm/boards/embest-marsboard/board.c | 90 +++++++++++++++++
arch/arm/boards/embest-marsboard/env/config-board | 6 ++
.../flash-header-embest-marsboard.imxcfg | 106 +++++++++++++++++++++
arch/arm/boards/embest-marsboard/lowlevel.c | 44 +++++++++
arch/arm/dts/Makefile | 2 +
arch/arm/mach-imx/Kconfig | 4 +
images/Makefile.imx | 5 +
9 files changed, 261 insertions(+)
create mode 100644 arch/arm/boards/embest-marsboard/Makefile
create mode 100644 arch/arm/boards/embest-marsboard/board.c
create mode 100644 arch/arm/boards/embest-marsboard/env/config-board
create mode 100644 arch/arm/boards/embest-marsboard/flash-header-embest-marsboard.imxcfg
create mode 100644 arch/arm/boards/embest-marsboard/lowlevel.c

diff --git a/arch/arm/boards/Makefile b/arch/arm/boards/Makefile
index 4934a42..df2519e 100644
--- a/arch/arm/boards/Makefile
+++ b/arch/arm/boards/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_MACH_EDB9315A) += edb93xx/
obj-$(CONFIG_MACH_EDB9315) += edb93xx/
obj-$(CONFIG_MACH_EFIKA_MX_SMARTBOOK) += efika-mx-smartbook/
obj-$(CONFIG_MACH_EMBEST_RIOTBOARD) += embest-riotboard/
+obj-$(CONFIG_MACH_EMBEST_MARSBOARD) += embest-marsboard/
obj-$(CONFIG_MACH_EUKREA_CPUIMX25) += eukrea_cpuimx25/
obj-$(CONFIG_MACH_EUKREA_CPUIMX27) += eukrea_cpuimx27/
obj-$(CONFIG_MACH_EUKREA_CPUIMX35) += eukrea_cpuimx35/
diff --git a/arch/arm/boards/embest-marsboard/Makefile b/arch/arm/boards/embest-marsboard/Makefile
new file mode 100644
index 0000000..e77796c
--- /dev/null
+++ b/arch/arm/boards/embest-marsboard/Makefile
@@ -0,0 +1,3 @@
+obj-y += board.o flash-header-embest-marsboard.dcd.o
+extra-y += flash-header-embest-marsboard.dcd.S flash-header-embest-marsboard.dcd
+lwl-y += lowlevel.o
diff --git a/arch/arm/boards/embest-marsboard/board.c b/arch/arm/boards/embest-marsboard/board.c
new file mode 100644
index 0000000..9ee80ff
--- /dev/null
+++ b/arch/arm/boards/embest-marsboard/board.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2014 Eric Bénard <***@eukrea.com>
+ * Copyright (C) 2013 Lucas Stach <***@pengutronix.de>
+ *
+ * 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 program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <asm/armlinux.h>
+#include <asm/io.h>
+#include <bootsource.h>
+#include <common.h>
+#include <environment.h>
+#include <envfs.h>
+#include <gpio.h>
+#include <init.h>
+#include <mach/bbu.h>
+#include <mach/generic.h>
+#include <mach/imx6-regs.h>
+#include <mach/imx6.h>
+#include <mfd/imx6q-iomuxc-gpr.h>
+#include <sizes.h>
+#include <linux/phy.h>
+
+static int ar8035_phy_fixup(struct phy_device *dev)
+{
+ u16 val;
+
+ /* Ar803x phy SmartEEE feature cause link status generates glitch,
+ * which cause ethernet link down/up issue, so disable SmartEEE
+ */
+ phy_write(dev, 0xd, 0x3);
+ phy_write(dev, 0xe, 0x805d);
+ phy_write(dev, 0xd, 0x4003);
+
+ val = phy_read(dev, 0xe);
+ phy_write(dev, 0xe, val & ~(1 << 8));
+
+ /* To enable AR8031 ouput a 125MHz clk from CLK_25M */
+ phy_write(dev, 0xd, 0x7);
+ phy_write(dev, 0xe, 0x8016);
+ phy_write(dev, 0xd, 0x4007);
+
+ val = phy_read(dev, 0xe);
+ val &= 0xffe3;
+ val |= 0x18;
+ phy_write(dev, 0xe, val);
+
+ /* introduce tx clock delay */
+ phy_write(dev, 0x1d, 0x5);
+ val = phy_read(dev, 0x1e);
+ val |= 0x0100;
+ phy_write(dev, 0x1e, val);
+
+ return 0;
+}
+
+static int marsboard_device_init(void)
+{
+ if (!of_machine_is_compatible("embest,marsboard"))
+ return 0;
+
+ phy_register_fixup_for_uid(0x004dd072, 0xffffffef, ar8035_phy_fixup);
+
+ imx6_bbu_internal_spi_i2c_register_handler("spiflash", "/dev/m25p0.barebox",
+ BBU_HANDLER_FLAG_DEFAULT, NULL, 0, 0);
+
+ return 0;
+}
+device_initcall(marsboard_device_init);
+
+static int marsboard_lwl_init(void)
+{
+ if (!of_machine_is_compatible("embest,marsboard"))
+ return 0;
+
+ barebox_set_hostname("marsboard");
+
+ imx6_init_lowlevel();
+
+ return 0;
+}
+postcore_initcall(marsboard_lwl_init);
diff --git a/arch/arm/boards/embest-marsboard/env/config-board b/arch/arm/boards/embest-marsboard/env/config-board
new file mode 100644
index 0000000..e8e8378
--- /dev/null
+++ b/arch/arm/boards/embest-marsboard/env/config-board
@@ -0,0 +1,6 @@
+#!/bin/sh
+
+# board defaults, do not change in running system. Change /env/config
+# instead
+
+global.linux.bootargs.base="console=ttymxc0,115200"
diff --git a/arch/arm/boards/embest-marsboard/flash-header-embest-marsboard.imxcfg b/arch/arm/boards/embest-marsboard/flash-header-embest-marsboard.imxcfg
new file mode 100644
index 0000000..60a39fe
--- /dev/null
+++ b/arch/arm/boards/embest-marsboard/flash-header-embest-marsboard.imxcfg
@@ -0,0 +1,106 @@
+soc imx6
+loadaddr 0x20000000
+dcdofs 0x400
+
+wm 32 0x020e05a8 0x00000030
+wm 32 0x020e05b0 0x00000030
+wm 32 0x020e0524 0x00000030
+wm 32 0x020e051c 0x00000030
+wm 32 0x020e0518 0x00000030
+wm 32 0x020e050c 0x00000030
+wm 32 0x020e05b8 0x00000030
+wm 32 0x020e05c0 0x00000030
+wm 32 0x020e05ac 0x00020030
+wm 32 0x020e05b4 0x00020030
+wm 32 0x020e0528 0x00020030
+wm 32 0x020e0520 0x00020030
+wm 32 0x020e0514 0x00020030
+wm 32 0x020e0510 0x00020030
+wm 32 0x020e05bc 0x00020030
+wm 32 0x020e05c4 0x00020030
+wm 32 0x020e056c 0x00020030
+wm 32 0x020e0578 0x00020030
+wm 32 0x020e0588 0x00020030
+wm 32 0x020e0594 0x00020030
+wm 32 0x020e057c 0x00020030
+wm 32 0x020e0590 0x00003000
+wm 32 0x020e0598 0x00003000
+wm 32 0x020e058c 0x00000000
+wm 32 0x020e059c 0x00003030
+wm 32 0x020e05a0 0x00003030
+wm 32 0x020e0784 0x00000030
+wm 32 0x020e0788 0x00000030
+wm 32 0x020e0794 0x00000030
+wm 32 0x020e079c 0x00000030
+wm 32 0x020e07a0 0x00000030
+wm 32 0x020e07a4 0x00000030
+wm 32 0x020e07a8 0x00000030
+wm 32 0x020e0748 0x00000030
+wm 32 0x020e074c 0x00000030
+wm 32 0x020e0750 0x00020000
+wm 32 0x020e0758 0x00000000
+wm 32 0x020e0774 0x00020000
+wm 32 0x020e078c 0x00000030
+wm 32 0x020e0798 0x000c0000
+wm 32 0x021b081c 0x33333333
+wm 32 0x021b0820 0x33333333
+wm 32 0x021b0824 0x33333333
+wm 32 0x021b0828 0x33333333
+wm 32 0x021b481c 0x33333333
+wm 32 0x021b4820 0x33333333
+wm 32 0x021b4824 0x33333333
+wm 32 0x021b4828 0x33333333
+wm 32 0x021b0018 0x00081740
+wm 32 0x021b001c 0x00008000
+wm 32 0x021b000c 0x555a7975
+wm 32 0x021b0010 0xff538e64
+wm 32 0x021b0014 0x01ff00db
+wm 32 0x021b002c 0x000026d2
+wm 32 0x021b0030 0x005b0e21
+wm 32 0x021b0008 0x09444040
+wm 32 0x021b0004 0x00025576
+wm 32 0x021b0040 0x00000027
+wm 32 0x021b0000 0x831a0000
+wm 32 0x021b001c 0x04088032
+wm 32 0x021b001c 0x0408803a
+wm 32 0x021b001c 0x00008033
+wm 32 0x021b001c 0x0000803b
+wm 32 0x021b001c 0x00428031
+wm 32 0x021b001c 0x00428039
+wm 32 0x021b001c 0x09408030
+wm 32 0x021b001c 0x09408038
+wm 32 0x021b001c 0x04008040
+wm 32 0x021b001c 0x04008048
+wm 32 0x021b0800 0xa1380003
+wm 32 0x021b4800 0xa1380003
+wm 32 0x021b0020 0x00005800
+wm 32 0x021b0818 0x00022227
+wm 32 0x021b4818 0x00022227
+wm 32 0x021b083c 0x434b0350
+wm 32 0x021b0840 0x034c0359
+wm 32 0x021b483c 0x434b0350
+wm 32 0x021b4840 0x03650348
+wm 32 0x021b0848 0x4436383b
+wm 32 0x021b4848 0x39393341
+wm 32 0x021b0850 0x35373933
+wm 32 0x021b4850 0x48254A36
+wm 32 0x021b080c 0x001f001f
+wm 32 0x021b0810 0x001f001f
+wm 32 0x021b480c 0x00440044
+wm 32 0x021b4810 0x00440044
+wm 32 0x021b08b8 0x00000800
+wm 32 0x021b48b8 0x00000800
+wm 32 0x021b001c 0x00000000
+wm 32 0x021b0404 0x00011006
+wm 32 0x020c4068 0x00c03f3f
+wm 32 0x020c406c 0x0030fc03
+wm 32 0x020c4070 0x0fffc000
+wm 32 0x020c4074 0x3ff00000
+wm 32 0x020c4078 0x00fff300
+wm 32 0x020c407c 0x0f0000c3
+wm 32 0x020c4080 0x000003ff
+/* enable AXI cache for VDOA/VPU/IPU */
+wm 32 0x020e0010 0xf00000cf
+/* set IPU AXI-id0 Qos=0xf(bypass AXI-id1 Qos=0x7 */
+wm 32 0x020e0018 0x007f007f
+wm 32 0x020e001c 0x007f007f
diff --git a/arch/arm/boards/embest-marsboard/lowlevel.c b/arch/arm/boards/embest-marsboard/lowlevel.c
new file mode 100644
index 0000000..47f0769
--- /dev/null
+++ b/arch/arm/boards/embest-marsboard/lowlevel.c
@@ -0,0 +1,44 @@
+#include <debug_ll.h>
+#include <common.h>
+#include <sizes.h>
+#include <io.h>
+#include <asm/barebox-arm-head.h>
+#include <asm/barebox-arm.h>
+#include <asm/sections.h>
+#include <asm/cache.h>
+#include <asm/mmu.h>
+#include <mach/imx6-mmdc.h>
+#include <mach/imx6.h>
+
+static inline void setup_uart(void)
+{
+ /* Enable UART for lowlevel debugging purposes */
+ writel(0x00000000, 0x021e8080);
+ writel(0x00004027, 0x021e8084);
+ writel(0x00000704, 0x021e8088);
+ writel(0x00000a81, 0x021e8090);
+ writel(0x0000002b, 0x021e809c);
+ writel(0x00013880, 0x021e80b0);
+ writel(0x0000047f, 0x021e80a4);
+ writel(0x0000c34f, 0x021e80a8);
+ writel(0x00000001, 0x021e8080);
+}
+
+extern char __dtb_imx6q_marsboard_start[];
+
+ENTRY_FUNCTION(start_imx6q_marsboard, r0, r1, r2)
+{
+ uint32_t fdt;
+
+ arm_cpu_lowlevel_init();
+
+ if (IS_ENABLED(CONFIG_DEBUG_LL)) {
+ writel(0x4, 0x020e016c);
+ setup_uart();
+ putc_ll('a');
+ }
+
+ fdt = (uint32_t)__dtb_imx6q_marsboard_start - get_runtime_offset();
+
+ barebox_arm_entry(0x10000000, SZ_1G, fdt);
+}
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 32fa44b..f6d00c1 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -26,6 +26,7 @@ dtb-$(CONFIG_ARCH_IMX6) += imx6q-gk802.dtb \
imx6q-nitrogen6x.dtb \
imx6dl-nitrogen6x.dtb \
imx6s-riotboard.dtb \
+ imx6q-marsboard.dtb \
imx6q-udoo.dtb
dtb-$(CONFIG_ARCH_MVEBU) += dove-cubox-bb.dtb
dtb-$(CONFIG_ARCH_SOCFPGA) += socfpga_cyclone5_sockit.dtb \
@@ -40,6 +41,7 @@ obj-$(CONFIG_BUILTIN_DTB) += $(BUILTIN_DTB).dtb.o
pbl-$(CONFIG_MACH_BEAGLEBONE) += am335x-bone.dtb.o am335x-boneblack.dtb.o
pbl-$(CONFIG_MACH_EFIKA_MX_SMARTBOOK) += imx51-genesi-efika-sb.dtb.o
pbl-$(CONFIG_MACH_EMBEST_RIOTBOARD) += imx6s-riotboard.dtb.o
+pbl-$(CONFIG_MACH_EMBEST_MARSBOARD) += imx6q-marsboard.dtb.o
pbl-$(CONFIG_MACH_FREESCALE_MX51_PDK) += imx51-babbage.dtb.o
pbl-$(CONFIG_MACH_FREESCALE_MX53_LOCO) += imx53-qsb.dtb.o imx53-qsrb.dtb.o
pbl-$(CONFIG_MACH_FREESCALE_MX53_VMX53) += imx53-voipac-bsb.dtb.o
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 15b78e2..a5b87e8 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -243,6 +243,10 @@ config MACH_SOLIDRUN_HUMMINGBOARD
bool "SolidRun Hummingboard"
select ARCH_IMX6

+config MACH_EMBEST_MARSBOARD
+ bool "Embest MarSBoard"
+ select ARCH_IMX6
+
config MACH_EMBEST_RIOTBOARD
bool "Embest RIoTboard"
select ARCH_IMX6
diff --git a/images/Makefile.imx b/images/Makefile.imx
index bd1b300..7d927ce 100644
--- a/images/Makefile.imx
+++ b/images/Makefile.imx
@@ -148,3 +148,8 @@ pblx-$(CONFIG_MACH_EMBEST_RIOTBOARD) += start_imx6s_riotboard
CFG_start_imx6s_riotboard.pblx.imximg = $(board)/embest-riotboard/flash-header-embest-riotboard.imxcfg
FILE_barebox-embest-imx6s-riotboard.img = start_imx6s_riotboard.pblx.imximg
image-$(CONFIG_MACH_EMBEST_RIOTBOARD) += barebox-embest-imx6s-riotboard.img
+
+pblx-$(CONFIG_MACH_EMBEST_MARSBOARD) += start_imx6q_marsboard
+CFG_start_imx6q_marsboard.pblx.imximg = $(board)/embest-marsboard/flash-header-embest-marsboard.imxcfg
+FILE_barebox-embest-imx6q-marsboard.img = start_imx6q_marsboard.pblx.imximg
+image-$(CONFIG_MACH_EMBEST_MARSBOARD) += barebox-embest-imx6q-marsboard.img

[Eric Bénard]

Signed-off-by: Eric Bénard <***@eukrea.com>
---
arch/arm/configs/embest_defconfig | 100 ++++++++++++++++++++++++++++++++++++++
1 file changed, 100 insertions(+)
create mode 100644 arch/arm/configs/embest_defconfig

diff --git a/arch/arm/configs/embest_defconfig b/arch/arm/configs/embest_defconfig
new file mode 100644
index 0000000..09b4d35
--- /dev/null
+++ b/arch/arm/configs/embest_defconfig
@@ -0,0 +1,100 @@
+CONFIG_ARCH_IMX=y
+CONFIG_IMX_MULTI_BOARDS=y
+CONFIG_MACH_EMBEST_MARSBOARD=y
+CONFIG_MACH_EMBEST_RIOTBOARD=y
+CONFIG_ARCH_IMX_USBLOADER=y
+CONFIG_IMX_IIM=y
+CONFIG_IMX_IIM_FUSE_BLOW=y
+CONFIG_THUMB2_BAREBOX=y
+CONFIG_CMD_ARM_MMUINFO=y
+CONFIG_ARM_OPTIMZED_STRING_FUNCTIONS=y
+CONFIG_ARM_UNWIND=y
+CONFIG_MMU=y
+CONFIG_TEXT_BASE=0x08f80000
+CONFIG_MALLOC_SIZE=0x4000000
+CONFIG_MALLOC_TLSF=y
+CONFIG_KALLSYMS=y
+CONFIG_RELOCATABLE=y
+CONFIG_LONGHELP=y
+CONFIG_HUSH_FANCY_PROMPT=y
+CONFIG_CMDLINE_EDITING=y
+CONFIG_AUTO_COMPLETE=y
+CONFIG_MENU=y
+CONFIG_CONSOLE_ACTIVATE_ALL=y
+CONFIG_DEFAULT_ENVIRONMENT_GENERIC_NEW=y
+CONFIG_DEFAULT_ENVIRONMENT_PATH="arch/arm/boards/embest-marsboard/env"
+CONFIG_DEFAULT_LOGLEVEL=6
+CONFIG_DEBUG_INFO=y
+CONFIG_CMD_EDIT=y
+CONFIG_CMD_SLEEP=y
+CONFIG_CMD_MSLEEP=y
+CONFIG_CMD_SAVEENV=y
+CONFIG_CMD_EXPORT=y
+CONFIG_CMD_READLINE=y
+CONFIG_CMD_MENU=y
+CONFIG_CMD_MENU_MANAGEMENT=y
+CONFIG_CMD_TIME=y
+CONFIG_CMD_TFTP=y
+CONFIG_CMD_ECHO_E=y
+CONFIG_CMD_MEMINFO=y
+CONFIG_CMD_IOMEM=y
+CONFIG_CMD_CRC=y
+CONFIG_CMD_CRC_CMP=y
+CONFIG_CMD_MD5SUM=y
+CONFIG_CMD_FLASH=y
+CONFIG_CMD_BOOTM_SHOW_TYPE=y
+CONFIG_CMD_BOOTM_VERBOSE=y
+CONFIG_CMD_BOOTM_INITRD=y
+CONFIG_CMD_BOOTM_OFTREE=y
+CONFIG_CMD_BOOTM_OFTREE_UIMAGE=y
+CONFIG_CMD_BOOTM_AIMAGE=y
+# CONFIG_CMD_BOOTU is not set
+CONFIG_CMD_RESET=y
+CONFIG_CMD_GO=y
+CONFIG_CMD_TIMEOUT=y
+CONFIG_CMD_PARTITION=y
+CONFIG_CMD_MAGICVAR=y
+CONFIG_CMD_MAGICVAR_HELP=y
+CONFIG_CMD_GPIO=y
+CONFIG_CMD_UNCOMPRESS=y
+CONFIG_CMD_I2C=y
+CONFIG_CMD_LED=y
+CONFIG_CMD_LED_TRIGGER=y
+CONFIG_CMD_MIITOOL=y
+CONFIG_CMD_CLK=y
+CONFIG_CMD_DETECT=y
+CONFIG_NET=y
+CONFIG_NET_DHCP=y
+CONFIG_NET_PING=y
+CONFIG_OFDEVICE=y
+CONFIG_OF_BAREBOX_DRIVERS=y
+CONFIG_DRIVER_NET_FEC_IMX=y
+CONFIG_AT803X_PHY=y
+CONFIG_DRIVER_SPI_IMX=y
+CONFIG_I2C=y
+CONFIG_I2C_IMX=y
+CONFIG_MTD=y
+CONFIG_MTD_M25P80=y
+CONFIG_MTD_SST25L=y
+CONFIG_USB=y
+CONFIG_USB_IMX_CHIPIDEA=y
+CONFIG_USB_EHCI=y
+CONFIG_USB_ULPI=y
+CONFIG_USB_STORAGE=y
+CONFIG_USB_GADGET=y
+CONFIG_USB_GADGET_DFU=y
+CONFIG_MCI=y
+CONFIG_MCI_IMX_ESDHC=y
+CONFIG_LED=y
+CONFIG_LED_GPIO=y
+CONFIG_LED_GPIO_OF=y
+CONFIG_LED_GPIO_RGB=y
+CONFIG_LED_GPIO_BICOLOR=y
+CONFIG_LED_TRIGGERS=y
+CONFIG_FS_EXT4=y
+CONFIG_FS_TFTP=y
+CONFIG_FS_NFS=y
+CONFIG_FS_FAT=y
+CONFIG_FS_FAT_WRITE=y
+CONFIG_FS_FAT_LFN=y
+CONFIG_LZO_DECOMPRESS=y

[Lucas Stach]

Hi Eric,

Post by Eric Bénard
---
arch/arm/configs/embest_defconfig | 100 ++++++++++++++++++++++++++++++++++++++
1 file changed, 100 insertions(+)
create mode 100644 arch/arm/configs/embest_defconfig

Please don't add new configs for multi-image capable boards. If anything
is missing from the imx_v7_defconfig just add it there. This means at
least both of your board additions should be reflected in the imx_v7
defconfig.

Regards,
Lucas

[Eric Bénard]

Hi Lucas,

Le Thu, 27 Mar 2014 11:07:56 +0100,

Post by Lucas Stach
Please don't add new configs for multi-image capable boards. If anything
is missing from the imx_v7_defconfig just add it there. This means at
least both of your board additions should be reflected in the imx_v7
defconfig.

OK, I'll include them to imx_v7_defconfig and also will factorize the
dts and board support as both boards are very similar.

Eric

[Sascha Hauer]

Hi Eric,

Post by Eric Bénard
+}
+postcore_initcall(marsboard_lwl_init);
diff --git a/arch/arm/boards/embest-marsboard/env/config-board b/arch/arm/boards/embest-marsboard/env/config-board
new file mode 100644
index 0000000..e8e8378
--- /dev/null
+++ b/arch/arm/boards/embest-marsboard/env/config-board
@@ -0,0 +1,6 @@
+#!/bin/sh
+
+# board defaults, do not change in running system. Change /env/config
+# instead
+
+global.linux.bootargs.base="console=ttymxc0,115200"

For the board specific environment I'd like to do the following:

move the $BOARD/env directory to a board specific name, like
$BOARD/marsboard-env. In your board code (when you know that you're
running on the marsboard), do: defaultenv_append_directory(marsboard_env);

For the environment snippet above: You can simply drop it. barebox will
append a correct 'console=' parameter automatically for you.

Post by Eric Bénard
+wm 32 0x020c407c 0x0f0000c3
+wm 32 0x020c4080 0x000003ff
+/* enable AXI cache for VDOA/VPU/IPU */
+wm 32 0x020e0010 0xf00000cf
+/* set IPU AXI-id0 Qos=0xf(bypass AXI-id1 Qos=0x7 */
+wm 32 0x020e0018 0x007f007f
+wm 32 0x020e001c 0x007f007f

You can probably drop these. The -next branch has a patch in it which
should do it:

3739b84 ARM i.MX6q: Mark VPU and IPU AXI transfers as cacheable, increase IPU priority

Sascha