5. SATA

5.1. Introduction

There is 1 M.2 interface on the ROC-RK3588-RT development board.

The default software is configured as M.2 SATA3.0 interface, which supports the use of SSDs with SATA protocol.

5.2. Software configuration

5.2.1. DTS configuration

Generally, according to the schematic diagram, select the correct controller node and PHY node to enable in DTS, and close the multiplexed controller node.

There is the following configuration in kernel-5.10/arch/arm64/boot/dts/rockchip/roc-rk3588-rt.dtsi:

/* SATA */
&sata2 {
    status = "okay";
};

&combphy2_psu {
    status = "okay";
};

&pcie2x1l1{
    status = "disabled";
};

&vcc_sata_pwr_en{
    status = "okay";
    gpio = <&gpio2 RK_PB5 GPIO_ACTIVE_HIGH>;
    regulator-min-microvolt = <3300000>;
    regulator-max-microvolt = <3300000>;
    regulator-always-on;
    enable-active-high;
    startup-delay-us = <5000>;
    vin-supply = <&vcc12v_dcin>;
};

combphy2_psu：PHY node

sata2：sata2 controller node

pcie2x1l1：pcie2x1l1 controller node

vcc_sata_pwr_en：sata power enable node

5.3. Mount

5.3.1. Auto mount

Format the hard drive to a usable format in the Android system interface to mount it automatically at boot.

5.3.2. Command to mount manually

• Find device nodes

ls /dev/block/sd*                                 
/dev/block/sda

• Formatted as EXT4 file format

mkfs.ext4 /dev/block/sda

• mount

mount /dev/block/sda /mnt/media_rw/

• View the mount path

df -h
/dev/block/sda               916G  24K  916G   1% /mnt/media_rw

or

cat /proc/mounts  | grep sda
/dev/block/sda /mnt/media_rw ext4 rw,seclabel,relatime 0 0

5.4. Read and write speed

The transfer rate of SATA3.0 is theoretically 6.0 Gbps. You can refer to the following commands to test the read and write speed:

• dd

# The path is modified according to the actual mount path
# Write 1G file
echo 3 > /proc/sys/vm/drop_caches
busybox dd if=/dev/zero of=/mnt/media_rw/41AD-09EA/test1 bs=1M count=1024 conv=sync
# Read 1G file
echo 3 > /proc/sys/vm/drop_caches
busybox dd if=/mnt/media_rw/41AD-09EA/test1 of=/dev/null conv=sync

• fio

# Using fio will format the hard drive
# Write
fio -filename=/dev/block/sda -direct=1 -iodepth 1 -thread -rw=write -ioengine=psync -bs=1M -size=200G -numjobs=30 -runtime=60 -group_reporting -name=mytes
# Read
fio -filename=/dev/block/sda -direct=1 -iodepth 1 -thread -rw=read -ioengine=psync -bs=1M -size=200G -numjobs=30 -runtime=60 -group_reporting -name=mytes