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| USB not detected when NANDcs is enable http://www.at91.com/samphpbb/viewtopic.php?f=4&t=20663 |
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| Author: | hamzeh.nasajpour [ Sun Feb 12, 2012 10:24 am ] |
| Post subject: | USB not detected when NANDcs is enable |
Hi, I run the "at91sam9260ek_demo_linux_nandflash.bat" file and upload the "bootloader", "kernel" and "rfs" to the NAND flash. Then I restart my board, but when I want to working with SAM-BA, the USB/ARM0 not detected. But if I disable the NANDcs (or disconnect this pin from microcontroller) and restart the board, the SAM-BA will detect the USB/ARM0. Has any idea for this problem or idea for solving it? |
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| Author: | CptTitanic [ Sun Feb 12, 2012 4:37 pm ] |
| Post subject: | Re: USB not detected when NANDcs is enable |
This is because RomBOOT is executing the code you uploaded to NAND, in order for it to enter SAM-BA it must not find bootable code as it searches through boot devices. The 9260-EK implemented a software breakout mode in the AT91BootStrap where pressing BP4 erased the first block of NAND allowing for RomBOOT to enter SAM-BA mode when the board is nexted booted. You should also be able to acheive NAND erasure using the uBoot command line. |
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