Diego Santa Cruz Diego.SantaCruz@spinetix.com wrote on 2014/11/28 12:12:56:
Hi,
-----Original Message----- From: Joakim Tjernlund [mailto:joakim.tjernlund@transmode.se] Sent: Friday, November 28, 2014 11:05 AM To: Diego Santa Cruz Cc: panto@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