{"id":69,"date":"2008-06-07T17:08:49","date_gmt":"2008-06-08T01:08:49","guid":{"rendered":"http:\/\/intr.overt.org\/blog\/?p=69"},"modified":"2008-06-07T17:08:49","modified_gmt":"2008-06-08T01:08:49","slug":"mmc-specification-now-available-for-free","status":"publish","type":"post","link":"https:\/\/blog.intr.overt.org\/?p=69","title":{"rendered":"MMC Specification now available for free"},"content":{"rendered":"

Wow, it’s been a long time since I’ve written anything, but I figure this is a good enough reason to do so. The SD specification has been available<\/a> for quite a while now, but up until now, the MMC specification has had a $5000 price tag stuck to it. This has kept it out of most people’s hands, although Nokia<\/a> were kind enough to buy a copy for Pierre<\/a>. However, they have now made the latest version (4.3) available without charge<\/a>. I believe this change of heart stems from the standardisation of eMMC through JEDEC<\/a> (They still charge for their other specs). Despite the focus on eMMC, it is the full specification (minus the section on using MMC over SPI which they have declared obsolete; this isn’t a big deal as there’s enough documentation around explaining how MMC over SPI works).<\/p>\n

What does this mean? Not that much in terms of Linux kernel support for MMC; Pierre already used his copy of the 4.2 spec to fix any problems and 4.3 doesn’t really add anything new that affects us. eMMC (Embedded MMC) is mostly just a new form-factor and doesn’t appear differently from a regular card. The one substantive new feature is the introduction of a special ‘boot partition’ which are accessed in a simplified way – presumably this was added to make it easy for a bootloader to load an OS off an eMMC. I don’t really see much demand emerging for this, so we have no immediate plans to support it (and good luck finding a card with a boot partition!) but if the need arose, we’d be able to do it.<\/p>\n

So, nothing’s changed in practical terms, but it’s still helpful for us that the spec is now freely available; however, it probably won’t do much to help MMC against the SD juggernaut. Anyone seen a high capacity MMC card despite them being ‘available’ for over two years now? Thought so.<\/p>\n","protected":false},"excerpt":{"rendered":"

Wow, it’s been a long time since I’ve written anything, but I figure this is a good enough reason to do so. The SD specification has been available for quite a while now, but up until now, the MMC specification has had a $5000 price tag stuck to it. This has kept it out of […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-69","post","type-post","status-publish","format-standard","hentry","category-sdmmc"],"_links":{"self":[{"href":"https:\/\/blog.intr.overt.org\/index.php?rest_route=\/wp\/v2\/posts\/69"}],"collection":[{"href":"https:\/\/blog.intr.overt.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.intr.overt.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.intr.overt.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.intr.overt.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=69"}],"version-history":[{"count":0,"href":"https:\/\/blog.intr.overt.org\/index.php?rest_route=\/wp\/v2\/posts\/69\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.intr.overt.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=69"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.intr.overt.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=69"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.intr.overt.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=69"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}