RT809H Programmer Tutorial: Fly Line Read/Write EMMC Boot and Erase Methods
Solder CLK, CMD, D0, and GND according to the points, and short the two ends of the crystal oscillator. Insert the soldered ISP cable into the ISP port of the RT809H programmer and power on the motherboard.
Open the RT809H programmer interface, click on smart recognition: EMMC ISP. Click settings, select the read/write partition and VCCQ, then confirm. Click read, choose the storage location, modify the filename for easy recognition, and click save.
When reading reaches 2%, click cancel. Click erase, and it will prompt: The software will automatically erase the corresponding area of EMMC before writing. Do you want to manually erase all data in the EMMC? Click confirm to start erasing data, and it will later prompt that the erasure was successful.
Click write, select the file path, double-click any file to start writing. When writing reaches 2%, click cancel. Disconnect the ISP cable, connect RX and TX to check the print information, set up the RT809H, disconnect the crystal oscillator short circuit, open SecureCRT and connect, power on the motherboard, and check if the boot has been written correctly. Turn off the motherboard circuit and insert the manufacturer’s upgrade file into the USB port. Press and hold the Enter key, power on the motherboard until the console appears.
After entering cu in the console and pressing Enter, it will automatically recognize the upgrade file and start the upgrade. Please patiently wait for the upgrade process.
Summary:
1. This method is aimed at solving the issue of EMMC internal user data errors that cause the manufacturer’s upgrade method to not be recognized;
2. This method addresses the issue of the logo card, where the manufacturer’s upgrade fails to restore intermittently;
3. This method is for addressing internal bad sectors of EMMC, where the manufacturer’s upgrade does not resolve the issue.
EMMC_AUTO_ISP fly line read/write, it is essential to stop the main chip from working to increase the success rate of read/write. The methods include: cutting off the power supply, shorting the two pins of the main chip’s crystal oscillator to ground, and applying a level to the reset pin for forced reset. The simplest method is: shorting the two pins of the main chip’s crystal oscillator to ground, using the original machine’s power supply, ensuring VCCIO voltage matches the EMMC power supply, fly 4 wires (CLK/CMD/D0/GND) for read/write.
Original text: http://www.jdwx.info/article-948-1.html
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