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linux/drivers/nvmem/rmem.c

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nvmem: Add driver to expose reserved memory as nvmem Firmware/co-processors might use reserved memory areas in order to pass data stemming from an nvmem device otherwise non accessible to Linux. For example an EEPROM memory only physically accessible to firmware, or data only accessible early at boot time. In order to expose this data to other drivers and user-space, the driver models the reserved memory area as an nvmem device. Tested-by: Tim Gover <tim.gover@raspberrypi.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20210129171430.11328-5-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-01-29 17:14:29 +00:00
nvmem: rmem: add CRC validation for Mobileye EyeQ5 NVMEM Mobileye EyeQ5 has a non-volatile memory region which gets used to store MAC addresses. Its format includes a prefix 12-byte header and a suffix 4-byte CRC. Add an optional ->checksum() callback inside match data; it runs CRC32 onto the content. Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20241230143035.265518-7-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-12-30 14:30:30 +00:00
nvmem: Add driver to expose reserved memory as nvmem Firmware/co-processors might use reserved memory areas in order to pass data stemming from an nvmem device otherwise non accessible to Linux. For example an EEPROM memory only physically accessible to firmware, or data only accessible early at boot time. In order to expose this data to other drivers and user-space, the driver models the reserved memory area as an nvmem device. Tested-by: Tim Gover <tim.gover@raspberrypi.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20210129171430.11328-5-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-01-29 17:14:29 +00:00
nvmem: rmem: add CRC validation for Mobileye EyeQ5 NVMEM Mobileye EyeQ5 has a non-volatile memory region which gets used to store MAC addresses. Its format includes a prefix 12-byte header and a suffix 4-byte CRC. Add an optional ->checksum() callback inside match data; it runs CRC32 onto the content. Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20241230143035.265518-7-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-12-30 14:30:30 +00:00
nvmem: Add driver to expose reserved memory as nvmem Firmware/co-processors might use reserved memory areas in order to pass data stemming from an nvmem device otherwise non accessible to Linux. For example an EEPROM memory only physically accessible to firmware, or data only accessible early at boot time. In order to expose this data to other drivers and user-space, the driver models the reserved memory area as an nvmem device. Tested-by: Tim Gover <tim.gover@raspberrypi.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20210129171430.11328-5-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-01-29 17:14:29 +00:00
nvmem: rmem: add CRC validation for Mobileye EyeQ5 NVMEM Mobileye EyeQ5 has a non-volatile memory region which gets used to store MAC addresses. Its format includes a prefix 12-byte header and a suffix 4-byte CRC. Add an optional ->checksum() callback inside match data; it runs CRC32 onto the content. Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20241230143035.265518-7-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-12-30 14:30:30 +00:00
nvmem: Add driver to expose reserved memory as nvmem Firmware/co-processors might use reserved memory areas in order to pass data stemming from an nvmem device otherwise non accessible to Linux. For example an EEPROM memory only physically accessible to firmware, or data only accessible early at boot time. In order to expose this data to other drivers and user-space, the driver models the reserved memory area as an nvmem device. Tested-by: Tim Gover <tim.gover@raspberrypi.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20210129171430.11328-5-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-01-29 17:14:29 +00:00
nvmem: rmem: make ->reg_read() straight forward code memory_read_from_buffer() is a weird choice; it: - is made for iteration with ppos a pointer. - does futile error checking in our case. - does NOT ensure we read exactly N bytes. Replace it by: 1. A check that (offset + bytes) lands inside the region and, 2. a plain memcpy(). Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20241230143035.265518-5-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-12-30 14:30:28 +00:00
nvmem: Add driver to expose reserved memory as nvmem Firmware/co-processors might use reserved memory areas in order to pass data stemming from an nvmem device otherwise non accessible to Linux. For example an EEPROM memory only physically accessible to firmware, or data only accessible early at boot time. In order to expose this data to other drivers and user-space, the driver models the reserved memory area as an nvmem device. Tested-by: Tim Gover <tim.gover@raspberrypi.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20210129171430.11328-5-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-01-29 17:14:29 +00:00
nvmem: rmem: make ->reg_read() straight forward code memory_read_from_buffer() is a weird choice; it: - is made for iteration with ppos a pointer. - does futile error checking in our case. - does NOT ensure we read exactly N bytes. Replace it by: 1. A check that (offset + bytes) lands inside the region and, 2. a plain memcpy(). Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20241230143035.265518-5-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-12-30 14:30:28 +00:00
nvmem: rmem: Fix return value check in rmem_read() In case of error, the function memremap() returns NULL pointer not ERR_PTR(). The IS_ERR() test in the return value check should be replaced with NULL test. Fixes: 5a3fa75a4d9c ("nvmem: Add driver to expose reserved memory as nvmem") Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Cc: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Acked-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20221118063840.6357-3-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-11-18 06:38:38 +00:00
nvmem: Add driver to expose reserved memory as nvmem Firmware/co-processors might use reserved memory areas in order to pass data stemming from an nvmem device otherwise non accessible to Linux. For example an EEPROM memory only physically accessible to firmware, or data only accessible early at boot time. In order to expose this data to other drivers and user-space, the driver models the reserved memory area as an nvmem device. Tested-by: Tim Gover <tim.gover@raspberrypi.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20210129171430.11328-5-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-01-29 17:14:29 +00:00
nvmem: rmem: Fix return value check in rmem_read() In case of error, the function memremap() returns NULL pointer not ERR_PTR(). The IS_ERR() test in the return value check should be replaced with NULL test. Fixes: 5a3fa75a4d9c ("nvmem: Add driver to expose reserved memory as nvmem") Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Cc: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Acked-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20221118063840.6357-3-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-11-18 06:38:38 +00:00
nvmem: Add driver to expose reserved memory as nvmem Firmware/co-processors might use reserved memory areas in order to pass data stemming from an nvmem device otherwise non accessible to Linux. For example an EEPROM memory only physically accessible to firmware, or data only accessible early at boot time. In order to expose this data to other drivers and user-space, the driver models the reserved memory area as an nvmem device. Tested-by: Tim Gover <tim.gover@raspberrypi.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20210129171430.11328-5-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-01-29 17:14:29 +00:00
nvmem: rmem: make ->reg_read() straight forward code memory_read_from_buffer() is a weird choice; it: - is made for iteration with ppos a pointer. - does futile error checking in our case. - does NOT ensure we read exactly N bytes. Replace it by: 1. A check that (offset + bytes) lands inside the region and, 2. a plain memcpy(). Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20241230143035.265518-5-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-12-30 14:30:28 +00:00
nvmem: Add driver to expose reserved memory as nvmem Firmware/co-processors might use reserved memory areas in order to pass data stemming from an nvmem device otherwise non accessible to Linux. For example an EEPROM memory only physically accessible to firmware, or data only accessible early at boot time. In order to expose this data to other drivers and user-space, the driver models the reserved memory area as an nvmem device. Tested-by: Tim Gover <tim.gover@raspberrypi.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20210129171430.11328-5-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-01-29 17:14:29 +00:00
nvmem: rmem: make ->reg_read() straight forward code memory_read_from_buffer() is a weird choice; it: - is made for iteration with ppos a pointer. - does futile error checking in our case. - does NOT ensure we read exactly N bytes. Replace it by: 1. A check that (offset + bytes) lands inside the region and, 2. a plain memcpy(). Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20241230143035.265518-5-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-12-30 14:30:28 +00:00
nvmem: Add driver to expose reserved memory as nvmem Firmware/co-processors might use reserved memory areas in order to pass data stemming from an nvmem device otherwise non accessible to Linux. For example an EEPROM memory only physically accessible to firmware, or data only accessible early at boot time. In order to expose this data to other drivers and user-space, the driver models the reserved memory area as an nvmem device. Tested-by: Tim Gover <tim.gover@raspberrypi.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20210129171430.11328-5-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-01-29 17:14:29 +00:00
nvmem: rmem: add CRC validation for Mobileye EyeQ5 NVMEM Mobileye EyeQ5 has a non-volatile memory region which gets used to store MAC addresses. Its format includes a prefix 12-byte header and a suffix 4-byte CRC. Add an optional ->checksum() callback inside match data; it runs CRC32 onto the content. Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20241230143035.265518-7-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-12-30 14:30:30 +00:00
nvmem: Add driver to expose reserved memory as nvmem Firmware/co-processors might use reserved memory areas in order to pass data stemming from an nvmem device otherwise non accessible to Linux. For example an EEPROM memory only physically accessible to firmware, or data only accessible early at boot time. In order to expose this data to other drivers and user-space, the driver models the reserved memory area as an nvmem device. Tested-by: Tim Gover <tim.gover@raspberrypi.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20210129171430.11328-5-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-01-29 17:14:29 +00:00
nvmem: rmem: add CRC validation for Mobileye EyeQ5 NVMEM Mobileye EyeQ5 has a non-volatile memory region which gets used to store MAC addresses. Its format includes a prefix 12-byte header and a suffix 4-byte CRC. Add an optional ->checksum() callback inside match data; it runs CRC32 onto the content. Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20241230143035.265518-7-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-12-30 14:30:30 +00:00
nvmem: Add driver to expose reserved memory as nvmem Firmware/co-processors might use reserved memory areas in order to pass data stemming from an nvmem device otherwise non accessible to Linux. For example an EEPROM memory only physically accessible to firmware, or data only accessible early at boot time. In order to expose this data to other drivers and user-space, the driver models the reserved memory area as an nvmem device. Tested-by: Tim Gover <tim.gover@raspberrypi.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20210129171430.11328-5-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-01-29 17:14:29 +00:00
nvmem: rmem: Use NVMEM_DEVID_AUTO It is reasonable to declare multiple nvmem blocks. Unless a unique 'id' is passed in for each block there may be name clashes. Avoid this by using the magic token NVMEM_DEVID_AUTO. Fixes: 5a3fa75a4d9c ("nvmem: Add driver to expose reserved memory as nvmem") Signed-off-by: Phil Elwell <phil@raspberrypi.com> Signed-off-by: Ivan T. Ivanov <iivanov@suse.de> Reviewed-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Message-ID: <20230611140330.154222-6-srinivas.kandagatla@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-06-11 15:03:09 +01:00
nvmem: Add driver to expose reserved memory as nvmem Firmware/co-processors might use reserved memory areas in order to pass data stemming from an nvmem device otherwise non accessible to Linux. For example an EEPROM memory only physically accessible to firmware, or data only accessible early at boot time. In order to expose this data to other drivers and user-space, the driver models the reserved memory area as an nvmem device. Tested-by: Tim Gover <tim.gover@raspberrypi.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20210129171430.11328-5-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-01-29 17:14:29 +00:00
nvmem: rmem: add CRC validation for Mobileye EyeQ5 NVMEM Mobileye EyeQ5 has a non-volatile memory region which gets used to store MAC addresses. Its format includes a prefix 12-byte header and a suffix 4-byte CRC. Add an optional ->checksum() callback inside match data; it runs CRC32 onto the content. Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20241230143035.265518-7-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-12-30 14:30:30 +00:00
nvmem: Add driver to expose reserved memory as nvmem Firmware/co-processors might use reserved memory areas in order to pass data stemming from an nvmem device otherwise non accessible to Linux. For example an EEPROM memory only physically accessible to firmware, or data only accessible early at boot time. In order to expose this data to other drivers and user-space, the driver models the reserved memory area as an nvmem device. Tested-by: Tim Gover <tim.gover@raspberrypi.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20210129171430.11328-5-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-01-29 17:14:29 +00:00
nvmem: rmem: add CRC validation for Mobileye EyeQ5 NVMEM Mobileye EyeQ5 has a non-volatile memory region which gets used to store MAC addresses. Its format includes a prefix 12-byte header and a suffix 4-byte CRC. Add an optional ->checksum() callback inside match data; it runs CRC32 onto the content. Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20241230143035.265518-7-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-12-30 14:30:30 +00:00
nvmem: Add driver to expose reserved memory as nvmem Firmware/co-processors might use reserved memory areas in order to pass data stemming from an nvmem device otherwise non accessible to Linux. For example an EEPROM memory only physically accessible to firmware, or data only accessible early at boot time. In order to expose this data to other drivers and user-space, the driver models the reserved memory area as an nvmem device. Tested-by: Tim Gover <tim.gover@raspberrypi.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20210129171430.11328-5-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-01-29 17:14:29 +00:00
nvmem: rmem: add CRC validation for Mobileye EyeQ5 NVMEM Mobileye EyeQ5 has a non-volatile memory region which gets used to store MAC addresses. Its format includes a prefix 12-byte header and a suffix 4-byte CRC. Add an optional ->checksum() callback inside match data; it runs CRC32 onto the content. Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20241230143035.265518-7-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-12-30 14:30:30 +00:00
nvmem: Add driver to expose reserved memory as nvmem Firmware/co-processors might use reserved memory areas in order to pass data stemming from an nvmem device otherwise non accessible to Linux. For example an EEPROM memory only physically accessible to firmware, or data only accessible early at boot time. In order to expose this data to other drivers and user-space, the driver models the reserved memory area as an nvmem device. Tested-by: Tim Gover <tim.gover@raspberrypi.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20210129171430.11328-5-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-01-29 17:14:29 +00:00