Changes between Version 22 and Version 23 of MMC

Timestamp:

04/07/2022 08:25:56 PM (2 years ago)

Author:

Tim Harvey

Comment:

added note about eMMC hardware partitioning limitations

MMC

@@ -113 +113 @@
 Because eMMC provides multiple hardware partitions but only one can be selected at a time. A non-volatile register in the eMMC device provides a PARTITION_CONFIG that is used to determine what partition is selected at power-up for boot devices. To access this data you need to read/write a 'Card Specific Data' or CSD register (EXT_CSD[179] - EXT_CSC_PART_CONFIG). This can be done both in Linux (see [#emmc-linux below]) or U-Boot (see [#emmc-uboot below]).
 
+Note that changing your eMMC partitioning differs a bit for each eMMC part (Manufacturer make and model) and needs to be done very early on as it can't succeed after a certain number of writes have occurred. If you need a specific partition configuration for a high volume product contact sales@gateworks.com for more info.
 
 [=#emmc-enhanced-user-area]