2011/9/19 Chris Ball <cjb@xxxxxxxxxx>: > Hi, > > On Sun, Sep 18 2011, NamJae Jeon wrote: >> mmc : boot partition is set as a read-write. >> >> There is a case that user directly update boot partition through mmcblk0boot0,1. >> However, the current boot partition is set as a read-only. >> I suggest that boot partition is set as a read-write if there is no >> reason that it should be read-only. > > There is a reason. > > Documentation/mmc/mmc-dev-parts.txt: > > MMC Boot Partitions > =================== > > Read and write access is provided to the two MMC boot partitions. Due to > the sensitive nature of the boot partition contents, which often store > a bootloader or bootloader configuration tables crucial to booting the > platform, write access is disabled by default to reduce the chance of > accidental bricking. > > To enable write access to /dev/mmcblkXbootY, disable the forced read-only > access with: > > echo 0 > /sys/block/mmcblkXbootY/force_ro > > == > - Chris. > -- > Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/> > One Laptop Per Child > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > Hi. Chris. There is the way you are. Thanks a lot. -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
