Re: [U-Boot] [PATCH v2 5/5] cgtqmx6eval: Protect the manufacturing information in SPI NOR

On Tue, Sep 22, 2015 at 4:11 PM, Jagan Teki jteki@openedev.com wrote:

On 12 September 2015 at 19:27, Otavio Salvador otavio@ossystems.com.br wrote:

...

+static void spinor_protect(void) +{

•   struct spi_flash *spi;
  

•   spi = spi_flash_probe(CONFIG_ENV_SPI_BUS, CONFIG_ENV_SPI_CS,
  

•                         CONFIG_ENV_SPI_MAX_HZ, CONFIG_ENV_SPI_MODE);
  

•   /*
  

•    * Set BP2 BP1 BP0 to 001, so that the last 64 sectors
  

•    * can be protected (0x3f0000 to 0x3fffff).
  

The last sector (64*1024) area is being protected here, why? does this specific to your board? And also your taking an example of (0x3f0000 to 0x3fffff) that means the flash your using is 4MB is it? then this again becomes your board specific? is it?

Yes, the protected range is board specific. Congatec put some data in this area which are valuable and should not be erased. So we need to protect it.