SATA

Introduction

There is 1 M.2 interface on the ROC-RK3588S-PC development board.

It can be configured as an M.2 SATA3.0 interface by software for use
with SSDs that support the SATA protocol, or as an M.2 PCIe2.0
interface by software to support the use of SSDs with the NVMe
protocol.

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


Software configuration

Method 1:Modify system settings

Settings->Connected devices -> M.2 SSD Type

Select the option SATA or PCIe that needs to take effect


The modification will take effect only after the system is restarted

Method 2: 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-rk3588s-pc.dtsi":

   #define M2_SATA_OR_PCIE 1 /*1 = SATA , 0 = PCIe */

   /* default use sata3.0 , pcie2.0 optional*/
   &combphy0_ps {
       status = "okay";
   };

   #if M2_SATA_OR_PCIE
   &sata0 {
       pinctrl-names = "default";
       pinctrl-0 = <&sata_reset>;
       status = "okay";
   };
   #else
   &pcie2x1l2 {
       reset-gpios = <&gpio3 RK_PD1 GPIO_ACTIVE_HIGH>;
       vpcie3v3-supply = <&vcc3v3_pcie20>;
       status = "okay";
   };
   #endif

"combphy0_ps"：PHY node

"sata0"：sata0 controller node

"pcie2x1l2"：pcie2x1l2 controller node

"M2_SATA_OR_PCIE"：

The default value is 1, which means it is configured as SATA3.0. If it
needs to be configured as PCIe2.0, it needs to be changed to 0

Mount

Auto mount

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

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

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