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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.

_images/usage_pcie_interface.png

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>;
&#125;;

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