From mboxrd@z Thu Jan 1 00:00:00 1970 From: Seungwon Jeon Subject: RE: [PATCH] mmc: core: Fix the incorrect calculation for erase unit size. Date: Wed, 14 Sep 2011 11:27:26 +0900 Message-ID: <002f01cc7285$d80dc660$88295320$%jun@samsung.com> References: <1315461565-16009-1-git-send-email-tgih.jun@samsung.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Return-path: In-reply-to: Content-language: ko Sender: linux-samsung-soc-owner@vger.kernel.org To: 'Chris Ball' Cc: linux-mmc@vger.kernel.org, linux-samsung-soc@vger.kernel.org, kgene.kim@samsung.com, dh.han@samsung.com List-Id: linux-mmc@vger.kernel.org Chris Ball wrote: > > Hi, > > On Thu, Sep 08 2011, Seungwon Jeon wrote: > > Erase unit size of high capacity is multiple of 512KiB not 1024KiB. > > Could we have some more info, please? What are the visible symptoms > of the erase unit size being incorrect, how did you realize this was > a problem, should this patch be applied to stable@, etc. It is mentioned from eMMC Spec. Erase unit size is defined in 512Kbyte * HC_ERASE_GRP_SIZE(EXT_CSD[224]). Thanks. > > Thanks, > > - Chris. > -- > Chris Ball > One Laptop Per Child