# CN9132 - Booting using the UART

**URL:** <https://community.solid-run.com/t/cn9132-booting-using-the-uart/487>\
**Category:** Uncategorized\
**Created:** [October 14, 2022, 7:51am UTC](https://community.solid-run.com/t/cn9132-booting-using-the-uart/487 "2022-10-14T07:51:25Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Henrik](https://avatars.discourse-cdn.com/v4/letter/h/ba9def/32.png) [@Henrik](https://community.solid-run.com/u/Henrik)\
**Post date:** [October 14, 2022, 7:51am UTC](https://community.solid-run.com/t/cn9132-booting-using-the-uart/487/1 "2022-10-14T07:51:25Z")

</div>

I got the CEx7 CN9132, but do not have access to the evaluation board due to shipping problems. To get started, I’m using an Express-BASE7 (Adlink) as a carrier, but have encountered some issues.

The board is configured to boot from SPI, but apparently the flash is empty. This is the output:  
BootROM - 2.03  
Starting CP-0 IOROM 1.07  
Booting from SPI NOR flash 1 (0x32)  
Error: no valid header till end of media  
Error: Failed boot attempt 01. error = 0x041

BootROM - 2.03  
Starting CP-0 IOROM 1.07  
Booting from SPI NOR flash 1 (0x32)  
Error: no valid header till end of media  
Error: Failed boot attempt 02. error = 0x018

BootROM - 2.03  
Starting CP-0 IOROM 1.07  
Booting from SPI NOR flash 1 (0x32)  
Error: no valid header till end of media  
Error: Failed boot attempt 03. error = 0x018

BootROM - 2.03  
Starting CP-0 IOROM 1.07  
Booting from SPI NOR flash 1 (0x32)  
Error: no valid header till end of media  
Error: Failed boot attempt 04. error = 0x018

Trying Uart…

To boot using the UART, I’ve done the following:  
Cloned the CN913x build repository ([GitHub - SolidRun/cn913x\_build](https://github.com/SolidRun/cn913x_build.git)) to get access to the tools to boot through UART.  
Downloaded the u-boot image u-boot-cn9132-cex7-A-spi.bin from [SolidRun Images](https://images.solid-run.com/CN913x/cn913x_build/20221002-4d9168b/u-boot)  
Ran the provided script (mrvl\_uart.sh), but without success.

I’ve tried to change the timing of when to power on the board in relation to when the script is executed, but I assume the escape sequence is only important when it actually have an image in flash that it can boot.

This is the output I get:

Using device connected on serial port “/dev/ttyS0”  
Loading flash image file “…/…/u-boot-cn9132-cex7-A-spi.bin”  
Press the “Reset” button on the target board and the “Enter” key on the host keyboard simultaneously  
Sending …/…/u-boot-cn9132-cex7-A-spi.bin, 13796 blocks: Give your local XMODEM receive command now.  
Xmodem sectors/kbytes sent: 0/ 0kRetry 0: Timeout on sector ACK

It will terminate unsuccessfully after several timeouts. It seems there’s no successful communication going on, and in fact I get the same output if I run the script without powering on the board.

I’ve tested the UART connection to another ComEx board, and I can both receive and transmit data to that board.

Any suggestions on how to proceed is greatly appreciated.