Phytec i.MX 93 - Page 54

i.MX 93 BSP Manual PD24.1.1 Documentation Rev.: imx8mp-pd22.1.2-51-ga548be7d
• To set the BKOPS_EN bit, execute:
target:~$ mmc bkops_en manual /dev/mmcblk0
• To ensure that the new setting is taken over and the kernel triggers BKOPS by itself, shut down the
system:
target:~$ poweroff
Tip
The BKOPS_EN bit is one-time programmable only. It cannot be reversed.
7.4.3 Reliable Write
There are two dierent Reliable Write options:
1. Reliable Write option for a whole eMMC device/partition.
2. Reliable Write for single write transactions.
Tip
Do not confuse eMMC partitions with partitions of a DOS, MBR, or GPT partition table (see the previous
section).
The rst Reliable Write option is mostly already enabled on the eMMCs mounted on the phyCORE-i.MX
93 SoMs. To check this on the running target:
target:~$ mmc extcsd read /dev/mmcblk0 | grep -A 5 WR_REL_SET
Write reliability setting register [WR_REL_SET]: 0x1f
user area: the device protects existing data if a power failure occurs during a write o
peration
partition 1: the device protects existing data if a power failure occurs during a write
operation
partition 2: the device protects existing data if a power failure occurs during a write
operation
partition 3: the device protects existing data if a power failure occurs during a write
operation
partition 4: the device protects existing data if a power failure occurs during a write
operation
--
Device supports writing EXT_CSD_WR_REL_SET
Device supports the enhanced def. of reliable write
Otherwise, it can be enabled with the mmc tool:
target:~$ mmc --help
[...]
mmc write_reliability set <-y|-n|-c> <partition> <device>
Enable write reliability per partition for the <device>.
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Accessing Peripherals 50