SATA

Introduction

There is 1 M.2 interface on the iCore-3576Q development board.

It can be configured as an M.2 SATA3.1 interface by software for use
with SSDs that support the SATA protocol, or as an M.2 PCIe2.1
interface by software to support the use of SSDs with the NVMe
protocol.

The default software is configured as M.2 SATA3.1 interface, which
supports the use of SSDs with SATA protocol.


Software 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/arch/arm64/boot/dts/rockchip/rk3576-firefly-aio-3576q.dts" and
"kernel/arch/arm64/boot/dts/rockchip/rk3576-firefly-aio-3576q.dtsi":

   #define SATA            1
   #define PCIE            0

   #if SATA && ( PCIE == 0 )
   &sata0 {
           status = "okay";
           pinctrl-0 = <&sata_reset>;
           pinctrl-names = "default";
   };
   #endif

   #if PCIE && ( SATA == 0 )
   &pcie0 {
           status = "okay";
           reset-gpios = <&gpio4 RK_PA7 GPIO_ACTIVE_HIGH>;
   };
   #endif

"combphy0_ps"：PHY node

"sata0"：sata0 controller node

"pcie0"：pcie2x1l2 controller node

The default configuration is SATA3.1. If you want to set to PCIe2.1,
you need to modify it as follows. Only one of the two functions can be
enabled

   #define SATA            0
   #define PCIE            1

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