[PATCH 1/9] m68k: dts: mcf5441x: add mmc device for mcf5441x

[PATCH 1/9] m68k: dts: mcf5441x: add mmc device for mcf5441x

[Angelo Dureghello]

Add mmc support for the mcf5441x family. There is only one esdhc
controller for this cpu family.

Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
---
 arch/m68k/dts/mcf5441x.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/m68k/dts/mcf5441x.dtsi b/arch/m68k/dts/mcf5441x.dtsi
index dcca36312f5..7cd6072d4a5 100644
--- a/arch/m68k/dts/mcf5441x.dtsi
+++ b/arch/m68k/dts/mcf5441x.dtsi
@@ -163,5 +163,13 @@
 			clock-frequency = <100000>;
 			status = "disabled";
 		};
+
+		esdhc: mmc@0xfc0cc000 {
+			compatible = "fsl,esdhc";
+			reg = <0xfc0cc000 0x8000>;
+			non-removable;
+			bus-width = <4>;
+			status = "disabled";
+		};
 	};
 };
-- 
2.53.0

[PATCH 2/9] m68k: dts: stmark2: enable esdhc

[Angelo Dureghello]

Enable esdhc device.

Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
---
 arch/m68k/dts/stmark2.dts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/m68k/dts/stmark2.dts b/arch/m68k/dts/stmark2.dts
index 3ba68b77d64..8e196fa65ff 100644
--- a/arch/m68k/dts/stmark2.dts
+++ b/arch/m68k/dts/stmark2.dts
@@ -45,3 +45,7 @@
 &i2c0 {
 	status = "okay";
 };
+
+&esdhc {
+	status = "okay";
+};
-- 
2.53.0

[PATCH 3/9] board: stmark2: add sd boot command

[Angelo Dureghello]

Add command to boot from sd.

Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
---
 include/configs/stmark2.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/configs/stmark2.h b/include/configs/stmark2.h
index c8a39e191a2..a7afbb3be1f 100644
--- a/include/configs/stmark2.h
+++ b/include/configs/stmark2.h
@@ -14,9 +14,12 @@
 	board/sysam/stmark2/sbf_dram_init.o (.text*)
 
 #define CFG_EXTRA_ENV_SETTINGS				\
+	"boot_sd=load mmc 0:1 ${loadaddr} uImage; "		\
+		"load mmc 0:1 ${loadaddr_ramfs} uRamfs\0"	\
 	"kern_size=0x700000\0"					\
-	"loadaddr=0x40001000\0"					\
+	"loadaddr=0x42000000\0"					\
 		"-(rootfs)\0"					\
+	"loadaddr_ramfs=0x43000000\0"				\
 	"update_uboot=loady ${loadaddr}; "			\
 		"sf probe 0:1 50000000; "			\
 		"sf erase 0 0x80000; "				\
-- 
2.53.0

[PATCH 4/9] board: stmark2: remove old garbage

[Angelo Dureghello]

Remove old erroneous garbage.

Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
---
 include/configs/stmark2.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/include/configs/stmark2.h b/include/configs/stmark2.h
index a7afbb3be1f..c1096398359 100644
--- a/include/configs/stmark2.h
+++ b/include/configs/stmark2.h
@@ -18,7 +18,6 @@
 		"load mmc 0:1 ${loadaddr_ramfs} uRamfs\0"	\
 	"kern_size=0x700000\0"					\
 	"loadaddr=0x42000000\0"					\
-		"-(rootfs)\0"					\
 	"loadaddr_ramfs=0x43000000\0"				\
 	"update_uboot=loady ${loadaddr}; "			\
 		"sf probe 0:1 50000000; "			\
-- 
2.53.0

Re: [PATCH 4/9] board: stmark2: remove old garbage

[Kuan-Wei Chiu]

Hi Angelo,

On Thu, Apr 16, 2026 at 02:14:26PM +0200, Angelo Dureghello wrote:
> Remove old erroneous garbage.
> 
> Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
> ---
>  include/configs/stmark2.h | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/include/configs/stmark2.h b/include/configs/stmark2.h
> index a7afbb3be1f..c1096398359 100644
> --- a/include/configs/stmark2.h
> +++ b/include/configs/stmark2.h
> @@ -18,7 +18,6 @@
>  		"load mmc 0:1 ${loadaddr_ramfs} uRamfs\0"	\
>  	"kern_size=0x700000\0"					\
>  	"loadaddr=0x42000000\0"					\
> -		"-(rootfs)\0"					\

Since this line was introduced in patch 3, would it be possible to fold
this change into that one?

Regards,
Kuan-Wei

>  	"loadaddr_ramfs=0x43000000\0"				\
>  	"update_uboot=loady ${loadaddr}; "			\
>  		"sf probe 0:1 50000000; "			\
> -- 
> 2.53.0
> 

Re: [PATCH 4/9] board: stmark2: remove old garbage

[Kuan-Wei Chiu]

On Sun, Apr 26, 2026 at 12:26:32AM +0800, Kuan-Wei Chiu wrote:
> Hi Angelo,
> 
> On Thu, Apr 16, 2026 at 02:14:26PM +0200, Angelo Dureghello wrote:
> > Remove old erroneous garbage.
> > 
> > Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
> > ---
> >  include/configs/stmark2.h | 1 -
> >  1 file changed, 1 deletion(-)
> > 
> > diff --git a/include/configs/stmark2.h b/include/configs/stmark2.h
> > index a7afbb3be1f..c1096398359 100644
> > --- a/include/configs/stmark2.h
> > +++ b/include/configs/stmark2.h
> > @@ -18,7 +18,6 @@
> >  		"load mmc 0:1 ${loadaddr_ramfs} uRamfs\0"	\
> >  	"kern_size=0x700000\0"					\
> >  	"loadaddr=0x42000000\0"					\
> > -		"-(rootfs)\0"					\
> 
> Since this line was introduced in patch 3, would it be possible to fold
> this change into that one?
> 
Please disregard my previous comment.
I misread the diff.

Regards,
Kuan-Wei

[PATCH 5/9] configs: stmark2: add support for mmc

[Angelo Dureghello]

Add support for mmc.

Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
---
 configs/stmark2_defconfig | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/configs/stmark2_defconfig b/configs/stmark2_defconfig
index ae1fa34df2a..763cbac158d 100644
--- a/configs/stmark2_defconfig
+++ b/configs/stmark2_defconfig
@@ -3,19 +3,19 @@ CONFIG_TEXT_BASE=0x47E00000
 CONFIG_SYS_MALLOC_LEN=0x40000
 CONFIG_SF_DEFAULT_SPEED=50000000
 CONFIG_ENV_SIZE=0x2000
-CONFIG_ENV_OFFSET=0x40000
+CONFIG_ENV_OFFSET=0x80000
 CONFIG_ENV_SECT_SIZE=0x10000
 CONFIG_DEFAULT_DEVICE_TREE="stmark2"
-CONFIG_SYS_MONITOR_LEN=262144
-CONFIG_SYS_LOAD_ADDR=0x40010000
+CONFIG_SYS_MONITOR_LEN=327680
+CONFIG_SYS_LOAD_ADDR=0x42000000
 CONFIG_TARGET_STMARK2=y
 CONFIG_SYS_BARGSIZE=256
 CONFIG_SYS_MONITOR_BASE=0x47E00400
 CONFIG_TIMESTAMP=y
 CONFIG_USE_BOOTARGS=y
-CONFIG_BOOTARGS="console=ttyS0,115200 root=/dev/ram0 rw rootfstype=ramfs rdinit=/bin/init devtmpfs.mount=1"
+CONFIG_BOOTARGS="console=ttyS0,115200 root=/dev/ram0 rw rootfstype=ramfs rdinit=/sbin/init devtmpfs.mount=1"
 CONFIG_USE_BOOTCOMMAND=y
-CONFIG_BOOTCOMMAND="sf probe 0:1 50000000; sf read ${loadaddr} 0x100000 ${kern_size}; bootm ${loadaddr}"
+CONFIG_BOOTCOMMAND="run boot_sd; bootm ${loadaddr} ${loadaddr_ramfs}"
 CONFIG_SYS_PBSIZE=283
 # CONFIG_DISPLAY_BOARDINFO is not set
 CONFIG_SYS_MALLOC_BOOTPARAMS=y
@@ -34,6 +34,12 @@ CONFIG_CMD_CACHE=y
 CONFIG_CMD_MTDPARTS=y
 CONFIG_MTDIDS_DEFAULT="nor0=spi-flash.0"
 CONFIG_MTDPARTS_DEFAULT="mtdparts=spi-flash.0:1m(u-boot),7m(kernel),-(rootfs)"
+CONFIG_CMD_MMC=y
+CONFIG_CMD_EXT2=y
+CONFIG_CMD_EXT4=y
+CONFIG_CMD_FAT=y
+CONFIG_CMD_FS_GENERIC=y
+CONFIG_DOS_PARTITION=y
 CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_ENV_SPI_CS=1
 CONFIG_ENV_RELOC_GD_ENV_ADDR=y
@@ -43,6 +49,8 @@ CONFIG_NO_NET=y
 CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_FSL=y
 CONFIG_MTD=y
+CONFIG_MMC=y
+CONFIG_FSL_ESDHC_IMX=y
 CONFIG_DM_SPI_FLASH=y
 CONFIG_SPI_FLASH_ISSI=y
 CONFIG_SPI_FLASH_MTD=y
-- 
2.53.0

Re: [PATCH 5/9] configs: stmark2: add support for mmc

[Kuan-Wei Chiu]

Hi Angelo,

On Thu, Apr 16, 2026 at 02:14:27PM +0200, Angelo Dureghello wrote:
> Add support for mmc.
> 
> Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>

it looks like the changes to stmark2_defconfig were edited manually.
Could you please use make savedefconfig to generate this file?

Regards,
Kuan-Wei

$ make stmark2_defconfig
$ make savedefconfig
$ diff -u configs/stmark2_defconfig defconfig
--- configs/stmark2_defconfig   2026-04-25 17:01:03.607521115 +0000
+++ defconfig   2026-04-25 17:01:11.186044050 +0000
@@ -28,18 +28,17 @@
 # CONFIG_CMD_IMPORTENV is not set
 CONFIG_CMD_I2C=y
 # CONFIG_CMD_LOADS is not set
+CONFIG_CMD_MMC=y
 CONFIG_CMD_SPI=y
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_CACHE=y
-CONFIG_CMD_MTDPARTS=y
-CONFIG_MTDIDS_DEFAULT="nor0=spi-flash.0"
-CONFIG_MTDPARTS_DEFAULT="mtdparts=spi-flash.0:1m(u-boot),7m(kernel),-(rootfs)"
-CONFIG_CMD_MMC=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_EXT4=y
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
-CONFIG_DOS_PARTITION=y
+CONFIG_CMD_MTDPARTS=y
+CONFIG_MTDIDS_DEFAULT="nor0=spi-flash.0"
+CONFIG_MTDPARTS_DEFAULT="mtdparts=spi-flash.0:1m(u-boot),7m(kernel),-(rootfs)"
 CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_ENV_SPI_CS=1
 CONFIG_ENV_RELOC_GD_ENV_ADDR=y
@@ -48,9 +47,8 @@
 CONFIG_NO_NET=y
 CONFIG_DM_I2C=y
 CONFIG_SYS_I2C_FSL=y
-CONFIG_MTD=y
 CONFIG_MMC=y
-CONFIG_FSL_ESDHC_IMX=y
+CONFIG_MTD=y
 CONFIG_DM_SPI_FLASH=y
 CONFIG_SPI_FLASH_ISSI=y
 CONFIG_SPI_FLASH_MTD=y

> ---
>  configs/stmark2_defconfig | 18 +++++++++++++-----
>  1 file changed, 13 insertions(+), 5 deletions(-)
> 
> diff --git a/configs/stmark2_defconfig b/configs/stmark2_defconfig
> index ae1fa34df2a..763cbac158d 100644
> --- a/configs/stmark2_defconfig
> +++ b/configs/stmark2_defconfig
> @@ -3,19 +3,19 @@ CONFIG_TEXT_BASE=0x47E00000
>  CONFIG_SYS_MALLOC_LEN=0x40000
>  CONFIG_SF_DEFAULT_SPEED=50000000
>  CONFIG_ENV_SIZE=0x2000
> -CONFIG_ENV_OFFSET=0x40000
> +CONFIG_ENV_OFFSET=0x80000
>  CONFIG_ENV_SECT_SIZE=0x10000
>  CONFIG_DEFAULT_DEVICE_TREE="stmark2"
> -CONFIG_SYS_MONITOR_LEN=262144
> -CONFIG_SYS_LOAD_ADDR=0x40010000
> +CONFIG_SYS_MONITOR_LEN=327680
> +CONFIG_SYS_LOAD_ADDR=0x42000000
>  CONFIG_TARGET_STMARK2=y
>  CONFIG_SYS_BARGSIZE=256
>  CONFIG_SYS_MONITOR_BASE=0x47E00400
>  CONFIG_TIMESTAMP=y
>  CONFIG_USE_BOOTARGS=y
> -CONFIG_BOOTARGS="console=ttyS0,115200 root=/dev/ram0 rw rootfstype=ramfs rdinit=/bin/init devtmpfs.mount=1"
> +CONFIG_BOOTARGS="console=ttyS0,115200 root=/dev/ram0 rw rootfstype=ramfs rdinit=/sbin/init devtmpfs.mount=1"
>  CONFIG_USE_BOOTCOMMAND=y
> -CONFIG_BOOTCOMMAND="sf probe 0:1 50000000; sf read ${loadaddr} 0x100000 ${kern_size}; bootm ${loadaddr}"
> +CONFIG_BOOTCOMMAND="run boot_sd; bootm ${loadaddr} ${loadaddr_ramfs}"
>  CONFIG_SYS_PBSIZE=283
>  # CONFIG_DISPLAY_BOARDINFO is not set
>  CONFIG_SYS_MALLOC_BOOTPARAMS=y
> @@ -34,6 +34,12 @@ CONFIG_CMD_CACHE=y
>  CONFIG_CMD_MTDPARTS=y
>  CONFIG_MTDIDS_DEFAULT="nor0=spi-flash.0"
>  CONFIG_MTDPARTS_DEFAULT="mtdparts=spi-flash.0:1m(u-boot),7m(kernel),-(rootfs)"
> +CONFIG_CMD_MMC=y
> +CONFIG_CMD_EXT2=y
> +CONFIG_CMD_EXT4=y
> +CONFIG_CMD_FAT=y
> +CONFIG_CMD_FS_GENERIC=y
> +CONFIG_DOS_PARTITION=y
>  CONFIG_ENV_IS_IN_SPI_FLASH=y
>  CONFIG_ENV_SPI_CS=1
>  CONFIG_ENV_RELOC_GD_ENV_ADDR=y
> @@ -43,6 +49,8 @@ CONFIG_NO_NET=y
>  CONFIG_DM_I2C=y
>  CONFIG_SYS_I2C_FSL=y
>  CONFIG_MTD=y
> +CONFIG_MMC=y
> +CONFIG_FSL_ESDHC_IMX=y
>  CONFIG_DM_SPI_FLASH=y
>  CONFIG_SPI_FLASH_ISSI=y
>  CONFIG_SPI_FLASH_MTD=y
> -- 
> 2.53.0
> 

[PATCH 6/9] configs: stmark2: add bdinfo command

[Angelo Dureghello]

Enable bdinfo command.

Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
---
 configs/stmark2_defconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configs/stmark2_defconfig b/configs/stmark2_defconfig
index 763cbac158d..0646197f3cb 100644
--- a/configs/stmark2_defconfig
+++ b/configs/stmark2_defconfig
@@ -22,7 +22,6 @@ CONFIG_SYS_MALLOC_BOOTPARAMS=y
 CONFIG_HUSH_PARSER=y
 # CONFIG_CMDLINE_EDITING is not set
 CONFIG_SYS_PROMPT="stmark2 $ "
-# CONFIG_CMD_BDI is not set
 # CONFIG_CMD_CONSOLE is not set
 # CONFIG_CMD_EXPORTENV is not set
 # CONFIG_CMD_IMPORTENV is not set
@@ -39,6 +38,7 @@ CONFIG_CMD_EXT2=y
 CONFIG_CMD_EXT4=y
 CONFIG_CMD_FAT=y
 CONFIG_CMD_FS_GENERIC=y
+CONFIG_CMD_BDI=y
 CONFIG_DOS_PARTITION=y
 CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_ENV_SPI_CS=1
-- 
2.53.0

[PATCH 7/9] mmc: Kconfig: allows m68k to use esdhc imx driver

[Angelo Dureghello]

Allow cpu families as mcf5441x (m68k) to use the fsl_esdhc_imx driver
since the hardware ip module is the same.

Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
---
 drivers/mmc/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index 22bd3a972bd..24bd16ad5f3 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -924,7 +924,7 @@ config ESDHCI_QUIRK_BROKEN_TIMEOUT_VALUE
 
 config FSL_ESDHC_IMX
 	bool "Freescale/NXP i.MX eSDHC controller support"
-	depends on MACH_IMX
+	depends on MACH_IMX || M68K
 	help
 	  This selects support for the i.MX eSDHC (Enhanced Secure Digital Host
 	  Controller) found on numerous Freescale/NXP SoCs.
-- 
2.53.0

[PATCH 8/9] m68k: mcf5441x: create stub to use imx drivers

[Angelo Dureghello]

Some NXP imx hardware ip module as the esdhc controller are exactly the
same in some new ColdFire cpus. For the specific case, mcf5441x needs to
use the existing fsl_esdhc_imx.c driver for the esdhc device.

Create a stub to be able to use NXP "imx" serie drivers as the
fsl_esdhc_imx in the ColdFire architecture.

Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
---
 arch/m68k/Kconfig                           |  1 +
 arch/m68k/include/asm/arch-mcf5445x/clock.h | 19 +++++++++++++++++
 arch/m68k/lib/Makefile                      |  1 +
 arch/m68k/lib/clock.c                       | 23 +++++++++++++++++++++
 4 files changed, 44 insertions(+)
 create mode 100644 arch/m68k/include/asm/arch-mcf5445x/clock.h
 create mode 100644 arch/m68k/lib/clock.c

diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 6ce8f577e3a..00e89bd0a62 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -62,6 +62,7 @@ config MCF5441x
 	select DM
         select DM_SERIAL
 	select ARCH_COLDFIRE
+	select CREATE_ARCH_SYMLINK
 	bool
 
 config M680x0
diff --git a/arch/m68k/include/asm/arch-mcf5445x/clock.h b/arch/m68k/include/asm/arch-mcf5445x/clock.h
new file mode 100644
index 00000000000..10ceecafcea
--- /dev/null
+++ b/arch/m68k/include/asm/arch-mcf5445x/clock.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * ColdFire clock support
+ *
+ * Copyright 2026 Kernelspace.
+ * Angelo Dureghello <angelo@kernel-space.org>
+ */
+
+#ifndef __CLOCK_H
+#define __CLOCK_H
+
+/* Stub to use fsl/nxp drivers. */
+enum mxc_clock {
+	MXC_ESDHC_CLK,
+};
+
+int mxc_get_clock(enum mxc_clock clk);
+
+#endif /* __CLOCK_H */
diff --git a/arch/m68k/lib/Makefile b/arch/m68k/lib/Makefile
index cf93715637a..9ad67c4272c 100644
--- a/arch/m68k/lib/Makefile
+++ b/arch/m68k/lib/Makefile
@@ -9,3 +9,4 @@ lib-$(CONFIG_USE_PRIVATE_LIBGCC) += lshrdi3.o muldi3.o ashldi3.o ashrdi3.o
 
 obj-$(CONFIG_CMD_BOOTM) += bootm.o
 obj-$(CONFIG_ARCH_COLDFIRE) += cache.o interrupts.o time.o traps.o bdinfo.o fec.o
+obj-$(CONFIG_MCF5441x) += clock.o
diff --git a/arch/m68k/lib/clock.c b/arch/m68k/lib/clock.c
new file mode 100644
index 00000000000..5d9aeed96c3
--- /dev/null
+++ b/arch/m68k/lib/clock.c
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2026 Kernelspace
+ * Angelo Dureghello <angelo@kernel-space.org>
+ */
+
+#include <config.h>
+#include <asm/arch/clock.h>
+#include <asm/global_data.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+/*
+ * Stub to use existing nxp/fsl drivers.
+ */
+int mxc_get_clock(enum mxc_clock clk)
+{
+	if (clk == MXC_ESDHC_CLK)
+		return gd->arch.sdhc_clk;
+
+	printf("Unsupported MXC CLK: %d\n", clk);
+
+	return 0;
+}
-- 
2.53.0

[PATCH 9/9] m68k: set proper u-boot image size for initial boot

[Angelo Dureghello]

There is a value of 256K hardcoded as u-boot image size. This
produce bank tty as soon as the image size grows over the limit.
Fix it by using value preset by CONFIG_SYS_MONITOR_LEN.

Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
---
 arch/m68k/cpu/mcf5445x/start.S | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/m68k/cpu/mcf5445x/start.S b/arch/m68k/cpu/mcf5445x/start.S
index f0264671d38..ae0e7c35d87 100644
--- a/arch/m68k/cpu/mcf5445x/start.S
+++ b/arch/m68k/cpu/mcf5445x/start.S
@@ -114,7 +114,7 @@ vector192_255:
 	/* Image header: chksum 4 bytes, len 4 bytes, img dest 4 bytes */
 asm_sbf_img_hdr:
 	.long	0x00000000		/* checksum, not yet implemented */
-	.long	0x00040000		/* image length */
+	.long	CONFIG_SYS_MONITOR_LEN	/* image length */
 	.long	CONFIG_TEXT_BASE	/* image to be relocated at */
 
 asm_dram_init:
@@ -292,7 +292,6 @@ asm_dspi_rd_status:
 	move.b	(%a3), %d1
 	rts
 #endif /* CONFIG_CF_SBF */
-
 #ifdef CONFIG_SYS_NAND_BOOT
 	/* copy 4 boot pages to dram as soon as possible */
 	/* each page is 996 bytes (1056 total with 60 ECC bytes */
-- 
2.53.0