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→Q: The system doesn't boot anymore. On the serial console I see just “CCCC” characters... Is there a recovery procedure
For detailed information, please refer to [[Booting_Linux_Kernel#Configuration_net_nfs | Configuration net_nfs]]
=== Q: The system doesn't boot anymore. On the serial console I see just “CCCC” characters... Is there a recovery procedure ? ===
'''A''': "CCCC" characters are the output of the internal bootrom that tries to boot from UART. It's likely that the first stage bootloader is missing or corrupted. System recovery is possible using one of the following strategies:
* bootable SD card (if available)
* serial file transfer (via XMODEM/YMODEM) - please refer to http://processors.wiki.ti.com/index.php/AM335x_U-Boot_User%27s_Guide#Boot_Over_UART
* JTAG (requires dedicated hardware - JTAG port, debugger/programmer - and software tools)
