summaryrefslogtreecommitdiffstats
path: root/doc
Commit message (Collapse)AuthorAgeFilesLines
* ram: Introduce K3 AM654 DDR Sub System driverLokesh Vutla2018-11-161-0/+46
| | | | | | | | | | | | | | | | | K3 based AM654 devices has DDR memory subsystem that comprises Synopys DDR controller, Synopsis DDR phy and wrapper logic to intergrate these blocks into the device. This DDR subsystem provides an interface to external SDRAM devices. Adding support for the initialization of the external SDRAM devices by configuring the DDRSS registers and using the buitin PHY routines. Reviewed-by: Tom Rini <trini@konsulko.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Signed-off-by: Andreas Dannenberg <dannenberg@ti.com> Signed-off-by: Keerthy <j-keerthy@ti.com> Signed-off-by: Schuyler Patton <spatton@ti.com> Signed-off-by: James Doublesin <doublesin@ti.com>
* w1-eeprom: Add support for Maxim DS2502 add only memoryMartin Fuzzey2018-11-161-0/+33
| | | | Signed-off-by: Martin Fuzzey <martin.fuzzey@flowbird.group>
* arm: at91: wdt: Convert watchdog driver to dm/dtPrasanthi Chellakumar2018-11-162-2/+2
| | | | | | | | Convert the Watchdog driver for AT91SAM9x processors to support the driver model and device tree. Changes "CONFIG_AT91SAM9_WATCHDOG" to new "CONFIG_WDT_AT91" Kconfig option. Signed-off-by: Prasanthi Chellakumar <prasanthi.chellakumar@microchip.com>
* dm: doc: Update description of pre-relocation supportBin Meng2018-11-141-4/+12
| | | | | | | | Add some description about pre-relocation driver binding, including usage of DM_FLAG_PRE_RELOC flag and caveats. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
* doc: Document virtio supportBin Meng2018-11-141-0/+253
| | | | | | | | | Add REAME.virtio to describe the information about U-Boot support for VirtIO devices, including supported boards, build instructions, driver details etc. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
* net: Add MT7628 ethernet driverStefan Roese2018-11-051-0/+17
| | | | | | | | | | | | | | | | | | | This patch adds ethernet support for the MIPS based Mediatek MT76xx SoCs (e.g. MT7628 and MT7688), including a minimum setup of the integrated switch. This driver is loosly based on the driver version included in this MediaTek github repository: https://github.com/MediaTek-Labs/linkit-smart-uboot.git Tested on the MT7688 LinkIt smart-gateway and on the Gardena-smart-gateway. Signed-off-by: Stefan Roese <sr@denx.de> Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> Cc: Joe Hershberger <joe.hershberger@ni.com> Cc: Frank Wunderlich <frankwu@gmx.de> Cc: Weijie Gao <hackpascal@gmail.com> Acked-by: Joe Hershberger <joe.hershberger@ni.com>
* Merge tag 'u-boot-imx-20181025' of git://git.denx.de/u-boot-imxTom Rini2018-10-2510-71/+63
|\ | | | | | | Merged imx8 architecture, fix build for imx8 + warnings
| * doc: imx: Improve i.MX documentation namingBreno Matheus Lima2018-10-228-0/+0
| | | | | | | | | | | | | | | | There is no need to have README in all i.MX documents name. Remove README from i.MX docs name and add .txt file extension. Signed-off-by: Breno Lima <breno.lima@nxp.com> Reviewed-by: Ye Li <ye.li@nxp.com>
| * doc: imx: misc: Reorganize miscellaneous documentationBreno Matheus Lima2018-10-221-0/+0
| | | | | | | | | | | | | | | | | | The Serial Download Protocol feature is availible in various i.MX SoCs. Move README.sdp document to imx/misc directory. Signed-off-by: Breno Lima <breno.lima@nxp.com>
| * doc: imx: hab: Reorganize High Assurance Boot documentationBreno Matheus Lima2018-10-222-44/+43
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The current High Assurance Boot document README.mxc_hab include details for the following features in a single file: - HAB Secure Boot - HAB Encrypted Boot Split HAB documentation in a specific directory for a cleaner documentation structure, subsequent patches will include more content in HAB documentation. Signed-off-by: Breno Lima <breno.lima@nxp.com>
| * doc: imx: Reorganize i.MX SoC common documentationBreno Matheus Lima2018-10-225-0/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The following documents describe device details according to the i.MX family: - README.imx25 - README.imx27 - README.imx5 - README.imx6 - README.mxs Move all device common related document to doc/imx/common for a better directory structure. Signed-off-by: Breno Lima <breno.lima@nxp.com>
| * doc: imx: mkimage: reorganize i.MX mkimage documentationBreno Matheus Lima2018-10-222-0/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | The following documents describe the image type used by the mkimage tool to generate U-Boot images for i.MX devices. - README.imximage - README.mxsimage Move all mkimage related document to doc/imx/mkimage for a better directory structure. Signed-off-by: Breno Lima <breno.lima@nxp.com>
| * doc: imx: Move SPD related info to the appropriate docBreno Matheus Lima2018-10-222-27/+20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently the Serial Download Protocol tools and procedure are documented in two places: - doc/imx/README.sdp - doc/imx/README.imx6 It is better to consolidate all SDP related information into README.sdp file, so move the content from README.imx6 to README.sdp. Signed-off-by: Breno Lima <breno.lima@nxp.com>
| * doc: imx: reorganize i.MX documentationBreno Matheus Lima2018-10-229-0/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently the U-Boot doc/ directory contains the following files that are only relevant for i.MX devices: - doc/README.imx25 - doc/README.imx27 - doc/README.imx5 - doc/README.imx6 - doc/README.imximage - doc/README.mxc_hab - doc/README.mxs - doc/README.mxsimage - doc/README.sdp Move all content to a common i.MX folder for a better documentation structure. Signed-off-by: Breno Lima <breno.lima@nxp.com>
* | x86: doc: Remove stale sections of 64-bit supportBin Meng2018-10-221-17/+0
| | | | | | | | | | | | | | | | There are some sections in current doc saying 64-bit is unsupported. This apparently is out of date. Remove it. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
* | x86: doc: Mention qemu-x86_64 supportBin Meng2018-10-221-2/+17
| | | | | | | | | | | | | | | | | | Currently only 32-bit U-Boot for QEMU x86 is documented. Mention the 64-bit support. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Reviewed-by: Simon Glass <sjg@chromium.org>
* | pci: Update documentation to make 'compatible' string optionalMarek Vasut2018-10-201-5/+9
| | | | | | | | | | | | | | | | | | | | | | Reword the documentation to make it clear the compatible string is now optional, yet still matching on it takes precedence over PCI IDs and PCI classes. Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com> Cc: Simon Glass <sjg@chromium.org> Cc: Tom Rini <trini@konsulko.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
* | Merge branch 'master' of git://git.denx.de/u-boot-netTom Rini2018-10-111-0/+8
|\ \
| * | net: phy: ti: Add binding for the CLK_OUT pin muxingJanine Hagemann2018-10-101-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The DP83867 has a muxing option for the CLK_OUT pin. It is possible to set CLK_OUT for different channels. Create a binding to select a specific clock for CLK_OUT pin. Based on commit 9708fb630d19 ("net: phy: dp83867: Add binding for the CLK_OUT pin muxing option") of mainline linux kernel. Signed-off-by: Janine Hagemann <j.hagemann@phytec.de> Acked-by: Joe Hershberger <joe.hershberger@ni.com>
| * | net: phy: ti: Add lane swapping support in the DP83867 TI's PHY driverJanine Hagemann2018-10-101-0/+5
| |/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds support for enabling or disabling the lane swapping (called "port mirroring" in PHY's CFG4 register) feature of the DP83867 TI's PHY device. One use case is when bootstrap configuration enables this feature (because of e.g. LED_0 wrong wiring) so then one needs to disable it in software (at u-boot/Linux). Based on commit fc6d39c39581 ("net: phy: dp83867: Add lane swapping support in the DP83867 TI's PHY driver") of mainline linux kernel. Signed-off-by: Janine Hagemann <j.hagemann@phytec.de> Acked-by: Lukasz Majewski <lukma@denx.de> Acked-by: Joe Hershberger <joe.hershberger@ni.com>
* | Merge tag 'dm-9oct18' of git://git.denx.de/u-boot-dmTom Rini2018-10-102-3/+20
|\ \ | | | | | | | | | | | | | | | Test improvements to tidy up output and drop duplicate tests Sandbox SPL/TPL support Various dm-related improvements
| * | fdt: Allow indicating a node is for U-Boot proper onlySimon Glass2018-10-091-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | At present it is not possible to specify that a node should be used before relocation (in U-Boot proper) without it also ending up in SPL and TPL device trees. Add a new "u-boot,dm-pre-proper" boolean property for this. Signed-off-by: Simon Glass <sjg@chromium.org>
| * | doc: Update docs for device tree in SPL, TPLSimon Glass2018-10-092-1/+12
| | | | | | | | | | | | | | | | | | | | | Make a few small updates to indicate that device tree can be used in SPL and TPL. Signed-off-by: Simon Glass <sjg@chromium.org>
| * | fdt: Document the fact that dtc is now builtSimon Glass2018-10-091-1/+5
| |/ | | | | | | | | | | | | This documentation is out of date now that U-Boot builds dtc automatically. Update it. Signed-off-by: Simon Glass <sjg@chromium.org>
* / cmd: pxe: add support for FIT config selectionPatrick Delaunay2018-10-081-0/+7
|/ | | | | | | | | | | | | | | | | | | | | | | | | | | Add a way in configuration files (exlinux.conf for sysboot command) to select a specific FIT configuration. The configuration is selected with a string added after the FIT filename in the label "KERNEL" or "LINUX", using the same format than bootm command: KERNEL [Filename]#<conf>[#<extra-conf[#...]] This configuration string, beginning by '#', is directly appended to bootm argument 1 after <kernel_addr_r>. bootm [<kernel_addr_r>]#<conf>[#<extra-conf[#...]] see doc/uImage.FIT/command_syntax_extensions.txt for details Example : KERNEL /fit.itb#cfg1 KERNEL /fit.itb#cfg2 Configuration can be use also for overlay management : KERNEL /fit.itb#cfg1#dtbo1#dtbo3 see doc/uImage.FIT/overlay-fdt-boot.txt for details Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
* avb_verify: support using OP-TEE TA AVBJens Wiklander2018-10-071-0/+13
| | | | | | | | With CONFIG_OPTEE_TA_AVB use the trusted application AVB provided by OP-TEE to manage rollback indexes and device-lock status. Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
* Documentation: tee uclass and op-tee driverJens Wiklander2018-10-071-0/+112
| | | | | Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
* dt/bindings: add bindings for opteeJens Wiklander2018-10-071-0/+31
| | | | | | | | | | | Sync with c8bfafb15944 ("dt/bindings: add bindings for optee") from Linux kernel. Introduces linaro prefix and adds bindings for ARM TrustZone based OP-TEE implementation. Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
* riscv: Add QEMU virt board supportBin Meng2018-10-031-0/+46
| | | | | | | | | | | | | | | | | | This adds QEMU RISC-V 'virt' board target support, with the hope of helping people easily test U-Boot on RISC-V. The QEMU virt machine models a generic RISC-V virtual machine with support for the VirtIO standard networking and block storage devices. It has CLINT, PLIC, 16550A UART devices in addition to VirtIO and it also uses device-tree to pass configuration information to guest software. It implements RISC-V privileged architecture spec v1.10. Both 32-bit and 64-bit builds are supported. Support is pretty much preliminary, only booting to U-Boot shell with the UART driver on a single core. Booting Linux is not supported yet. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
* Merge branch 'master' of git://git.denx.de/u-boot-spiTom Rini2018-10-025-7/+12
|\ | | | | | | | | | | | | This is the PR for SPI-NAND changes along with few spi changes. [trini: Re-sync changes for ls1012afrwy_qspi*_defconfig] Signed-off-by: Tom Rini <trini@konsulko.com>
| * dt-bindings: Add bindings for SPI NAND devicesBoris Brezillon2018-09-201-0/+5
| | | | | | | | | | | | | | | | Add bindings for SPI NAND chips. Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Acked-by: Jagan Teki <jagan@openedev.com>
| * mtd: move NAND files into a raw/ subdirectoryMiquel Raynal2018-09-204-7/+7
| | | | | | | | | | | | | | | | | | NAND flavors, like serial and parallel, have a lot in common and would benefit to share code. Let's move raw (parallel) NAND specific code in a raw/ subdirectory, to ease the addition of a core file in nand/ and the introduction of a spi/ subdirectory specific to SPI NANDs. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
* | Merge branch 'master' of git://git.denx.de/u-boot-videoTom Rini2018-09-291-0/+23
|\ \ | | | | | | | | | Signed-off-by: Tom Rini <trini@konsulko.com>
| * | video_osd: Add ihs_video_out driverMario Six2018-09-281-0/+23
| | | | | | | | | | | | | | | | | | | | | Add a driver for IHS OSDs on IHS FPGAs. Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Mario Six <mario.six@gdsys.cc>
* | | dt-bindings: w1-eeprom: eep_sandbox: create bindingsEugen Hristev2018-09-281-0/+34
| | | | | | | | | | | | | | | | | | Bindings for sandbox onewire eeprom driver Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
* | | dt-bindings: w1-eeprom: ds24xxx: create bindingsEugen Hristev2018-09-281-0/+37
| | | | | | | | | | | | | | | | | | Bindings for Maxim's ds24 onewire EEPROM families driver Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
* | | dt-bindings: W1: w1-gpio: added bindings for w1-gpioEugen Hristev2018-09-281-0/+40
| | | | | | | | | | | | | | | | | | | | | Added bindings specification for bitbanged gpio driver for Dallas one wire protocol Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
* | | doc: dtbinding: Add file system firmware loader binding documentTien Fong Chee2018-09-282-0/+69
| | | | | | | | | | | | | | | | | | | | | | | | Add a document to describe file system firmware loader binding information. Signed-off-by: Tien Fong Chee <tien.fong.chee@intel.com> Reviewed-by: Simon Glass <sjg@chromium.org>
* | | doc: Add new doc for file system firmware loader driver modelTien Fong Chee2018-09-281-0/+133
|/ / | | | | | | | | | | | | | | | | | | | | Provide information about - overview of file system firmware loader driver model - describe storage device and partition in device tree source - describe fie system firmware loader API Signed-off-by: Tien Fong Chee <tien.fong.chee@intel.com> Reviewed-by: Simon Glass <sjg@chromium.org>
* | dm: Update README.txt to clarify device tree usageTom Rini2018-09-251-0/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | In the section about Device Trees add a paragraph at the end that clarifies how we decide of a tree is valid or not. We say that all bindings must either be in the specification (link provided) or in our device-tree-bindings directory. We say that most of these come from the Linux Kernel and as such some design decisions are made for us already, but that in most cases we wish to retain compatibility. Cc: Simon Glass <sjg@chromium.org> Cc: Bin Meng <bmeng.cn@gmail.com> Signed-off-by: Tom Rini <trini@konsulko.com> Reviewed-by: Simon Glass <sjg@chromium.org>
* | pinctrl: bcm6838: add pinctrl supportPhilippe Reynes2018-09-221-0/+35
|/ | | | | | Add pinctrl support for broadcom bcm6838 SoC. Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
* doc/git-mailrc: add Stefan Roese to the kirkwood aliasBaruch Siach2018-09-191-1/+1
| | | | | | | | Stefan is listed as a kirkwood maintainer since commit f822d8578ba3 (MAINTAINERS: Update Marvell custodianship). Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Stefan Roese <sr@denx.de>
* remoteproc: Introduce K3 remoteproc driverLokesh Vutla2018-09-111-0/+50
| | | | | | | | Add support for K3 based remoteproc driver that communicates with TISCI to start start a remote processor. Reviewed-by: Tom Rini <trini@konsulko.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
* remoteproc: Introduce K3 system controllerLokesh Vutla2018-09-111-0/+24
| | | | | | | | | | | | | | | | | K3 specific SoCs have a dedicated microcontroller for doing resource management. Any HLOS/firmware on compute clusters should load a firmware to this microcontroller before accessing any resource. Adding support for loading this firmware. After the K3 system controller got loaded with firmware and started up it sends out a boot notification message through the secure proxy facility using the TI SCI protocol. Intercept and receive this message through the rproc start operation which will need to get invoked explicitly after the firmware got loaded. Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Signed-off-by: Andreas Dannenberg <dannenberg@ti.com> Reviewed-by: Tom Rini <trini@konsulko.com>
* mailbox: Introduce K3 Secure Proxy DriverLokesh Vutla2018-09-111-0/+40
| | | | | | | | | | Secure Proxy module manages hardware threads that are meant for communication between the processor entities. Adding support for this driver. Reviewed-by: Tom Rini <trini@konsulko.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Signed-off-by: Andreas Dannenberg <dannenberg@ti.com>
* sysreset: Add TI System Control Interface (TI SCI) sysreset driverAndreas Dannenberg2018-09-111-0/+29
| | | | | | | | | | | | | | | | | Devices from the TI K3 family of SoCs like the AM654x contain a Device Management and Security Controller (SYSFW) that manages the low-level device control (like clocks, resets etc) for the various hardware modules present on the SoC. These device control operations are provided to the host processor OS through a communication protocol called the TI System Control Interface (TI SCI) protocol. This patch adds a system reset driver that communicates to the system controller over the TI SCI protocol for allowing to perform a system- wide SoC reset. Reviewed-by: Tom Rini <trini@konsulko.com> Signed-off-by: Andreas Dannenberg <dannenberg@ti.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
* power domain: Introduce TI System Control Interface (TI SCI) power domain driverAndreas Dannenberg2018-09-111-0/+52
| | | | | | | | | | | | | | | | | | | | | | | Some TI Keystone 2 and K3 family of SoCs contain a system controller (like the Power Management Micro Controller (PMMC) on 66AK2G SoCs and the Device Management and Security Controller on AM65x SoCs) that manage the low-level device control (like clocks, resets etc) for the various hardware modules present on the SoC. These device control operations are provided to the host processor OS through a communication protocol called the TI System Control Interface (TI SCI) protocol. This patch adds a power domain driver that communicates to the system controller over the TI SCI protocol for performing power management of various devices present on the SoC. Various power domain functionalities are achieved by the means of different TI SCI device operations provided by the TI SCI framework. This code is loosely based on the drivers/soc/ti/ti_sci_pm_domains.c driver of the Linux kernel. Reviewed-by: Tom Rini <trini@konsulko.com> Signed-off-by: Andreas Dannenberg <dannenberg@ti.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
* clk: Introduce TI System Control Interface (TI SCI) clock driverAndreas Dannenberg2018-09-111-0/+53
| | | | | | | | | | | | | | | | | | | | | | | | Some TI Keystone 2 and K3 family of SoCs contain a system controller (like the Power Management Micro Controller (PMMC) on 66AK2G SoCs and the Device Management and Security Controller on AM65x SoCs) that manage the low-level device control (like clocks, resets etc) for the various hardware modules present on the SoC. These device control operations are provided to the host processor OS through a communication protocol called the TI System Control Interface (TI SCI) protocol. This patch adds a clock driver that communicates to the system controller over the TI SCI protocol for performing clock management of various devices present on the SoC. Various clock functionality is achieved by the means of different TI SCI device operations provided by the TI SCI framework. This code is loosely based on the drivers/clk/keystone/sci-clk.c driver of the Linux kernel. Reviewed-by: Tom Rini <trini@konsulko.com> Signed-off-by: Andreas Dannenberg <dannenberg@ti.com> Signed-off-by: Vignesh R <vigneshr@ti.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
* reset: Introduce TI System Control Interface (TI SCI) reset driverAndreas Dannenberg2018-09-111-0/+54
| | | | | | | | | | | | | | | | | | | | | | | Some TI Keystone 2 and K3 family of SoCs contain a system controller (like the Power Management Micro Controller (PMMC) on 66AK2G SoCs and the Device Management and Security Controller on AM65x SoCs) that manage the low-level device control (like clocks, resets etc) for the various hardware modules present on the SoC. These device control operations are provided to the host processor OS through a communication protocol called the TI System Control Interface (TI SCI) protocol. This patch adds a reset driver that communicates to the system controller over the TI SCI protocol for performing reset management of various devices present on the SoC. Various reset functionalities are achieved by the means of different TI SCI device operations provided by the TI SCI framework. This code is loosely based on the drivers/reset/reset-ti-sci.c driver of the Linux kernel. Reviewed-by: Tom Rini <trini@konsulko.com> Signed-off-by: Andreas Dannenberg <dannenberg@ti.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
* firmware: Add basic support for TI System Control Interface (TI SCI) protocolLokesh Vutla2018-09-111-0/+76
| | | | | | | | | | | | | | | | | | | | Texas Instrument's System Control Interface (TI SCI) message protocol is used in Texas Instrument's System on Chip (SoC) such as those in the K3 family AM654 SoC to communicate between various compute processors with a central system controller entity. The TI SCI message protocol provides support for management of various hardware entities within the SoC. Add support driver to allow communication with system controller entity within the SoC using the mailbox client. This is mostly derived from the TI SCI driver in Linux located at drivers/firmware/ti_sci.c. Reviewed-by: Tom Rini <trini@konsulko.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> Signed-off-by: Nishanth Menon <nm@ti.com> Signed-off-by: Andreas Dannenberg <dannenberg@ti.com>
generated by cgit (git 2.34.1) at 2024-07-07 00:40:53 +0000