Diego Santa Cruz <diego.santac...@spinetix.com> wrote on 2014/11/28 12:12:56: > > Hi, > > > -----Original Message----- > > From: Joakim Tjernlund [mailto:joakim.tjernl...@transmode.se] > > Sent: Friday, November 28, 2014 11:05 AM > > To: Diego Santa Cruz > > Cc: pa...@antoniou-consulting.com; u-boot@lists.denx.de > > Subject: Re: [U-Boot] [PATCH 00/18] Support for eMMC partitioning and related > > fixes > > > > > > I have the need to hardware partition eMMC devices from U-Boot along > > > with setting enhanced and reliable write attributes. > > > > > > This series of patches adds this support to U-Boot via a new mmc > > > API, a few new members of struct mmc and a new mmc sub-command. It > > > also features several fixes to the eMMC hardware partition support. I > > > have tested this with Micron eMMC 4.41 parts and it is working as > > > expected. > > > > This is really great, thanks. > > Good to know it may be useful to other people. > > > > > I do wonder(I am fairly new to eMMC) about 512B emulation. > > In mmc utils there is a: > > mmc disable 512B emulation <device> > > Set the eMMC data sector size to 4KB by disabling emulation on > > <device>. > > > > I am hoping 4K size will increase performance and reliability? > > Could you add this feature too to your patch set? > > > > I think this was introduced in eMMC 4.51. I do not have any 4.51 devices at hand to test with but I am not sure there would be any performance benefit to issue reads and writes in the 4KB large sector size. All eMMC devices I've seen write in chunks much larger than 4 KB internally anyhow (the ones I'm using now have a superpage size of 32 KB). Writes should be aligned to the superpage size to get good performance.
Sorry for the delay, I guess this option is there for a reason and performance/reliability is the only thing that comes to mind. I guess Linux is happier with 4K sector sizes? Jocke _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
