en:emmc_reference_chart [ODROID Wiki]

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====== eMMC Module ======

<WRAP left round important 60%>

  * Check the eMMC module compatibility.
  * If your eMMC is corrupted or have a wrong boot loader, reinstall the proper boot loader in the eMMC via [[emmc_recovery|eMMC Recovery]].

</WRAP>



====== eMMC modules for current running products 2016~ ======
{{:en:emmcreference2.jpg?350|}}



====== eMMC modules for old products ======
{{:en:others:emmc_ref_chart.png?600}}

Note: XU4 and XU3 have software compatibility each other.
===== Reference =====
=== eMMC Module & eMMC Reader Schematics ===

[[http://forum.odroid.com/download/file.php?id=433|Download eMMC module schematics]]\\
[[http://forum.odroid.com/download/file.php?id=1036&mode=view|eMMC reader board schematics]]\\
eMMC board dimensions : 18.5mm x 13.5mm\\
Gap between the PCBs : 1.1mm (Height of assembled B2B connectors\\

=== eMMC connector specification ===

The connector is made by LS-Mtron Korea.\\
On the eMMC module, we've used the GB042-34S-H10 (Socket-34pin). \\
On the host board, we've used the GB042-34P-H10 (Plug-34pin). \\

[[http://www.lsmtron.com/pdf/Connector&Antenna_catalog.PDF|The connector specification is here]]


=== Information about Sandisk eMMC (iDisk Extreme) ===
[[http://www.sandisk.com/products/embedded/inand/inand-extreme]]

=== Information about Samsung eMMC ===
[[http://www.samsung.com/semiconductor/products/flash-storage/emmc/]]

=== Information about Essencore eMMC (8GB eMMC is used for XU4) ===
[[http://www.the-aio.com/emmcfeature]]

=== Information about Toshiba eMMC ===
[[https://toshiba.semicon-storage.com/us/product/memory/nand-flash/mlc-nand/emmc.html]]


===== eMMC Read/Write test on ODROID-C2 HS400 mode =====
Unit : MByte/sec
|       |         |  Samsung  |  Toshiba  |  Sandisk  |
|   8G  |  Write  |    45.4   |    21.9   |    N/A    |
|   8G  |  Read   |    113    |    148    |    N/A    |
|  16G  |  Write  |    80.1   |    N/A    |    25.6   |
|  16G  |  Read   |    126    |    N/A    |    153    |
|  32G  |  Write  |    124    |    N/A    |    98.7   |
|  32G  |  Read   |    125    |    N/A    |    153    |
|  64G  |  Write  |    124    |    83.7   |    107    |
|  64G  |  Read   |    124    |    153    |    153    |

Note 1: Write/Read command for the eMMC benchmark.\\
$ dd if=/dev/zero of=test.tmp oflag=direct bs=1M count=1024 \\
$ dd if=test.tmp of=/dev/null iflag=direct bs=1M \\

Note 2: \\
Black eMMC module is made with Samsung eMMC chipset.\\
Red/Blue(normal) eMMC module is made with Sandisk or Toshiba or AIO chipset.\\
C1/C0/C1+/C2 works with Black and Red eMMC modules.\\
XU4/XU3/U3/X2/U2 do NOT work with Black eMMC module.\\

===== New 8GB eMMC test on XU4 Ubuntu =====

New 8GB eMMC Red PCB for XU4 model is based on AIO's eMMC 5.0 technology. \\

Sequential speed with "dd" test \\
dd write : 15.1 MB/s \\
dd read : 104 MB/s \\

Random access(IOPS) speed test with 4k block.\\
Random write : io=993228KB, bw=9928.2KB/s, iops=2482 \\
Random read : io=1479.1MB, bw=15149KB/s, iops=3787 \\


===== eMMC vs SD card performance comparison on C2 Android =====

16GB eMMC Black PCB\\
16GB UHS-1 SDHC Card (Sandisk SDSDQAD-016G UHS-I 50 OEM model)

Cleanly flashed Android 5.1 V2.8 image and installed GApps Pico package.\\
eMMC booting time from power on event : 18~20 seconds \\
SDHC booting time from power on event : 32~35 seconds \\


===== Check points for system software developers =====

* Do not overwrite the hidden eMMC boot partition.  If you have, go here to recover: [[en:emmc_recovery|How to recover the eMMC boot loader.]] \\

* eMMC must be partitioned like so; \\
---FAT16 partition with UUID 6E35-5356 (boot)\\
---EXT4 partition with UUID e139ce78-9841-40fe-8823-96a304a09859 (linux)\\

* Copy contents from Ubuntu image partitions to the boot and linux partitions using "cp -afpv source destination"\\

* Insert eMMC and boot normally.\\