mirror of
https://github.com/NXP/imx-firmware.git
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66 lines
2.3 KiB
Text
66 lines
2.3 KiB
Text
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The helper_uart is a UART download helper for boosting firmware UART
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download speed.
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Without such a helper, the normal firmware download baudrate is fixed
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to 115200bps by bootrom code. When using the helper, the bootrom first
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download the helper itself at the fixed baudrate. Then the helper
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runs and changes the UART baudrate to a higher speed, say 3Mbps. And
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finally the firmware is downloaded at this high speed to save the
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total download time.
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The helper is very small, less than 3KB. So it can be downloaded very
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fast even at 115200bps baudrate. Time saved using higher baudrate for
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downloading firmware easily compensate for the time in downloading
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the small helper itself.
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Uart download related files:
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|-fw_loader_arm
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|-fw_loader_linux
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|-fw_loader_win.exe
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|-helper_uart_115200.bin
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|-helper_uart_230400.bin
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|-helper_uart_921600.bin
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|-helper_uart_2000000.bin
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|-helper_uart_3000000.bin
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|-helper_uart_3250000.bin
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Eg: fw_loader.exe com1 115200 0 helper_uart_3000000.bin
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How to download the FW image:
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We use a marvell proprietary protocol to download the FW image.
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Please refer to UART_HELPER.txt for more details on the protocol.
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We use the new helper protocol to download both the helper and the FW image.
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Once the FW is downloaded on the chip, it automatically starts running
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from its entry point.
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There are different fw_loader executables available depending on the
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Platform on which it is to be run.
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Boot ROM code does not enable UART HW flow control. This means that while
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downloading the helper, Flow Control should be disabled. Once the helper
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is downloaded, Flow Control should be set to 1, to download the FW.
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<Format: fw_loader_win.exe ComPort BaudRate FlowControl FileName>
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e.g.
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Windows:
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Download Helper:
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fw_loader_win.exe com1 115200 0 helper_uart_3000000.bin
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Download FW image at specified BaudRate:
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fw_loader_win.exe com1 3000000 1 firmware.image
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Linux:
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Download Helper:
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./fw_loader_linux /dev/ttyUSB# 115200 0 helper_uart_3000000.bin
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Download FW image at specified BaudRate:
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./fw_loader_linux /dev/ttyUSB# 3000000 1 firmware.image
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Saar:
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Download Helper:
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./fw_loader_arm /dev/ttyUSB# 115200 0 helper_uart_3000000.bin
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Download FW image at specified BaudRate:
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./fw_loader_arm /dev/ttyUSB# 3000000 1 firmware.image
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