Message ID | 20190129220705.5143-1-jonas@norrbonn.se |
---|---|
Headers | show |
Series | spi-nor block protection | expand |
Hi, Just a gentle reminder that I'd like some feedback on these patches. Thanks, Jonas On 29/01/2019 23:07, Jonas Bonn wrote: > Changed in v2: > * Provide the below cover letter > * Rebase patches so they apply cleanly on linux-next > > > In order to make device that's effectively read-only except to an > authorized user we need: > > i) Some way of defaulting block-protection to on when device is first > powered > ii) Some way of controlling the write-protect signal so that the BP > (block protect) bits can't be changed > > Some SPI flashes support the BPNV configuration register bit: block > protect non-volatile. When this bit is set, the block protection bits > BP0, BP1, and BP2 default to 1, effectively causing the flash memory to > becomes read-only at power on. If we can set this bit, we solve problem > i) above. > > Controlling the write-protect input is a matter for something external > to the flash itself. Unfortunately, the WP# signal is only honoured if > the status register bit SRWD (status register write disable) is set. If > we can have this bit always set, then we solve problem ii) above. > > This short patch series provides the above bits, allowing for the > creation of a device that's effectively read-only to any actor who isn't > able to control the WP# signal. > > Jonas Bonn (3): > mtd: spi-nor: always respect write-protect input > mtd: spi-nor: s25fl512s supports region locking > mtd: spi-nor: allow setting the BPNV (default locked) bit > > drivers/mtd/mtdchar.c | 6 ++ > drivers/mtd/mtdcore.c | 8 +++ > drivers/mtd/spi-nor/spi-nor.c | 119 ++++++++++++++++++++++------------ > include/linux/mtd/mtd.h | 2 + > include/linux/mtd/spi-nor.h | 1 + > include/uapi/mtd/mtd-abi.h | 1 + > 6 files changed, 97 insertions(+), 40 deletions(-) >
On 02/14/2019 11:21 AM, Jonas Bonn wrote: > Hi, Hi, > > Just a gentle reminder that I'd like some feedback on these patches. yep, I'm going to review them these days, I still have few in my queue. Cheers, ta