[U-Boot] [PATCH v2 12/12] spi: Add SPI NOR protection mechanism

[Tom Rini]

On Sat, Oct 24, 2015 at 01:26:54PM -0200, Fabio Estevam wrote:

> From: Fabio Estevam <fabio.estevam at freescale.com>
> 
> Many SPI flashes have protection bits (BP2, BP1 and BP0) in the
> status register that can protect selected regions of the SPI NOR.
> 
> Take these bits into account when performing erase operations,
> making sure that the protected areas are skipped.
> 
> Tested on a mx6qsabresd:
> 
> => sf probe
> SF: Detected M25P32 with page size 256 Bytes, erase size 64 KiB, total 4 MiB
> => sf protect lock  0x3f0000 0x10000
> => sf erase 0x3f0000 0x10000
> offset 0x3f0000 is protected and cannot be erased
> SF: 65536 bytes @ 0x3f0000 Erased: ERROR
> => sf protect unlock  0x3f0000 0x10000
> => sf erase 0x3f0000 0x10000
> SF: 65536 bytes @ 0x3f0000 Erased: OK
> 
> Signed-off-by: Fabio Estevam <fabio.estevam at freescale.com>

Reviewed-by: Tom Rini <trini at konsulko.com>

-- 
Tom
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