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Date: Sun, 18 Sep 2011 23:32:46 -0400 From: Chris Ball <cjb@...top.org> To: NamJae Jeon <linkinjeon@...il.com> Cc: Linus Walleij <linus.ml.walleij@...il.com>, linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: RFC : mmc : boot partition is set as a read-write. 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@...top.org> <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@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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