{"id":52,"date":"2007-07-09T07:32:30","date_gmt":"2007-07-09T15:32:30","guid":{"rendered":"http:\/\/intr.overt.org\/blog\/?p=52"},"modified":"2007-07-09T07:32:30","modified_gmt":"2007-07-09T15:32:30","slug":"latest-n800-firmware-includes-sdhc-support","status":"publish","type":"post","link":"https:\/\/blog.intr.overt.org\/?p=52","title":{"rendered":"Latest n800 firmware includes SDHC support"},"content":{"rendered":"

I’ve been on holiday for the last week and a half, so I missed the firmware update while I was away, but I’m sure most of you are aware that a new firmware<\/a> for the n800 is out and that is includes SDHC support. This means that you don’t need a custom kernel with my patches to use these cards. I’m not quite sure what to make of the statement that support only goes up to 8GB, as I can’t think of where any code cares. The SDHC spec defines sizes up to 32GB and the FAT32 filesystem is functional (if very inefficient) to much larger sizes. So I have to assume it’s some higher level part of the stack and not a kernel issue.<\/p>\n

I still need to do more investigation, but from looking at the osso52 patch<\/a>, some of the patches in my old patch set are still not present, and it might just be worth offering a custom kernel with those added capabilities.<\/p>\n

Here’s my patch list and the current state of osso58 with respect to each:<\/p>\n

    \n
  1. 0001-mmc-update-19: Now merged<\/li>\n
  2. 0002-mmc-update-19: Now merged<\/li>\n
  3. 0003-highspeed-caps: Not merged – might result in problems with some 4GB MMCplus cards<\/li>\n
  4. 0004-low-voltage: Not merged – but not needed because of how 0005 is handled<\/li>\n
  5. 0005-omap2-low-voltage: Not merged – but an equivalent change that hacks around the absence of 0004 is present – so the functionality should be the same<\/li>\n
  6. \n<\/li>\n
  7. 0006-omap2-highspeed: Not merged – only needed with 0003<\/li>\n
  8. 0007-debug-output: Not merged – just debug output<\/li>\n<\/ol>\n

    So, the main missing thing is the set of timing checks that, unintentionally, make some MMCplus cards work. I will try with one of these cards soon and report if the changes are still needed. Additionally, a separate change has been made in the Nokia kernel that caps the MMC frequency at 24MHz where the maximum was previous 48MHz. I assume they have a good reason for this, but I had good results running highspeed MMC and SD cards at 48MHz and there is a real improvement in transfer rate.<\/p>\n

    If anyone has specific experiences, please add a comment. I will do more investigations and report, possibly with a new kernel, later this week.<\/p>\n","protected":false},"excerpt":{"rendered":"

    I’ve been on holiday for the last week and a half, so I missed the firmware update while I was away, but I’m sure most of you are aware that a new firmware for the n800 is out and that is includes SDHC support. This means that you don’t need a custom kernel with my […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,6],"tags":[],"class_list":["post-52","post","type-post","status-publish","format-standard","hentry","category-maemo","category-sdmmc"],"_links":{"self":[{"href":"https:\/\/blog.intr.overt.org\/index.php?rest_route=\/wp\/v2\/posts\/52"}],"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=52"}],"version-history":[{"count":0,"href":"https:\/\/blog.intr.overt.org\/index.php?rest_route=\/wp\/v2\/posts\/52\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.intr.overt.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=52"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.intr.overt.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=52"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.intr.overt.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=52"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}