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With uClinux running on the i.MX RT1050RT10XX, you get the full Linux TCP/IP stack (kernel version 56.156.7136)). Userspace POSIX APIs are provided by the uClibc library. Key user-space networking tools and utilities are available from the multi-call busybox. Additional tools and packages, such as for instance the SSH dropbear server, can be built specifically for uClinux. All in all, you have the powerful Linux TCP/IP stack at your disposal.

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For the run-time configuration of the kernel, Ethernet is enabled in rootfs.dts.IMXRT105X_NXPEVK or rootfs.dts.IMXRT106X_NXPEVK in projects/rootfs as follows:

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This will register a platform device for the i.MX RT1050 RT10XX Ethernet controller with the Ethernet driver.

The Linux project provided by Emcraft in the distribution (refer to projects/rootfs) and installed on each shipping module and kit includes the TCP/IP stack and various network related capabilities. The following snapshot shows the full Linux bootsrap sequence from power-on to the Linux shell:

Code Block
U-Boot SPL 20222024.04 (SepDec 2519 20232024 - 08:16:2146 +0000)
Trying to boot from MMC1


U-Boot 20222024.04 (SepDec 2524 20232024 - 0806:1630:2118 +0000)

DRAM:  32 MiB
Core:  7179 devices, 1318 uclasses, devicetree: separate
MMC:   FSL_SDHC: 0
Loading Environment from MMC... OK
In:    serial@40184000
Out:   serial@40184000
Err:   serial@40184000
Net:   eth0: ethernet@402D8000ethernet@402d8000
Hit any key to stop autoboot:  0
=> 
=> reset
resetting ...

U-Boot SPL 20222024.04 (SepDec 2519 20232024 - 08:16:2146 +0000)
Trying to boot from MMC1


U-Boot 20222024.04 (SepDec 2524 20232024 - 0806:1630:2118 +0000)

DRAM:  32 MiB
Core:  7179 devices, 1318 uclasses, devicetree: separate
MMC:   FSL_SDHC: 0
Loading Environment from MMC... OK
In:    serial@40184000
Out:   serial@40184000
Err:   serial@40184000
Net:   eth0: ethernet@402D8000ethernet@402d8000
Hit any key to stop autoboot:  0
82774628579371 bytes read in 14655856 ms (51.4 MiB/s)
## Booting kernel from Legacy Image at 80007fc0 ...
   Image Name:   Linux-56.156.7136
   Image Type:   ARM Linux Multi-File Image (uncompressed)
   Data Size:    82773988579307 Bytes = 78.92 MiB
   Load Address: 80008000
   Entry Point:  80008001
   Contents:
      Image 0: 82698568567460 Bytes = 78.92 MiB
      Image 1: 753011835 Bytes = 711.46 KiB
   Verifying Checksum ... OK
## Flattened Device Tree from multi component Image at 80007FC0
   Booting using the fdt at 0x807eb02c0x80833ab0
Working FDT set to 80833ab0
   Loading Multi-File Image to 80008000
   Loading Device Tree to 81e8100081dfa000, end 81e85d6981dffe3a ... OK
Working FDT set to 81dfa000

Starting kernel ...

Booting Linux on physical CPU 0x0
Linux version 56.156.7136 (sasha@workbench.emcraft.com) 
(arm-none-eabi-gcc (GNU Arm Embedded Toolchain 10.3-2021.10) 10.3.1 
20210824 (release), 
GNU ld (GNU Arm Embedded Toolchain 10.3-2021.10) 
2.36.1.20210621) #2 MonPREEMPT SepTue Dec 2524 0806:0342:1132 UTC 20232024
CPU: ARMv7-M [411fc271] revision 1 (ARMv7M), cr=00000000
CPU: PIPT / VIPT nonaliasing data cache, PIPT instruction cache
OF: fdt: Machine model: NXP IMXRT1050IMXRT1060-evk board
Reserved memory: created DMA memory pool at 0x81f000000x81e00000, size 1 MiB
OF: reserved mem: initialized node dmapool@81f00000dmapool@81e00000, compatible id 
shared-dma-pool
OF: reserved mem: 0x81e00000..0x81efffff (1024 KiB) nomap non-reusable dmapool@81e00000
OF: reserved mem: 0x81f00000..0x81ffffff (1024 KiB) nomap non-reusable memory@81f00000
Zone ranges:
  Normal   [mem 0x0000000080000000-0x0000000081ffffff]
Movable zone start for each node
Early memory node ranges
  node   0: [mem 0x0000000080000000-0x0000000081efffff0x0000000081dfffff]
  node   0: [mem 0x0000000081f000000x0000000081e00000-0x0000000081ffffff]
Initmem setup node 0 [mem 0x0000000080000000-0x0000000081ffffff]
Built 1 zonelists, mobility grouping off. 
Total pages: 8128
Kernel command line: ip=192.168.1.8682:192.168.1.9689:192.168.1.254:255.255.
0255.0::eth0:off
Unknown kernel command line parameters "ip=192.168.1.8682:192.168.1.9689:192.
168.1.254:255.255.0255.0::eth0:off",  will be passed to user space.
Dentry cache hash table entries: 4096 (order: 2, 16384 bytes, linear)
Inode-cache hash table entries: 2048 (order: 1, 8192 bytes, linear)
Built 1 zonelists, mobility grouping on.  Total pages: 8128
mem auto-init: stack:off, heap alloc:off, heap free:off
Memory: 23224K21868K/32768K available (3282K3663K kernel code, 180K222K rwdata, 868K1004K rodata, 3256K 3544K init, 97K119K bss, 9544K10900K reserved, 0K cma-reserved)
NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
Switching to timer-based delay loop, resolution 333ns
sched_clock: 32 bits at SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
rcu: Preemptible hierarchical RCU implementation.
rcu: RCU calculated value of scheduler-enlistment delay is 100 jiffies.
NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
rcu: srcu_init: Setting srcu_struct sizes based on contention.
Switching to timer-based delay loop, resolution 333ns
sched_clock: 32 bits at 3000kHz, resolution 333ns, wraps every 715827882841ns
clocksource: mxc_timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 
637086815595 ns
CalibratingConsole: delaycolour loop (skipped), value dummy device 80x30
printk: console [tty0] enabled
Calibrating delay loop (skipped), value calculated using timer frequency.. 6.00 
BogoMIPS (lpj=300003000)
pid_max: default: 4096 minimum: 301
Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
rcu: Hierarchical SRCU implementation.
rcu:    Max phase no-delay instances is 400.
devtmpfs: initialized
DMA: default coherent area is set
clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 
191126044627500001911260446275000 ns
futex hash table entries: 16 (order: -5, 192 bytes, linear)
pinctrl core: initialized pinctrl subsystem
NET: Registered PF_NETLINK/PF_ROUTE protocol family
imxrt1050-pinctrl 401f8000.pinctrl: initialized IMX pinctrl driver
imxrt1050-pinctrl 400a8000.pinctrl-no fsl,pins and pins property in node /soc/pinctrl@401f8000/adc1grp
imxrt1050-pinctrl 401f8000.pinctrl: initialized IMX pinctrl driver
imxrt1050-pinctrl 400a8000.pinctrl-snvs: initialized IMX pinctrl driver
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
pps_core: LinuxPPS API ver. 1 registered
pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
PTP clock support registered
Bluetooth: Core ver 2.22
NET: Registered PF_BLUETOOTH protocol family
Bluetooth: HCI device and connection manager initialized
Bluetooth: HCI socket layer initialized
Bluetooth: L2CAP socket layer initialized
Bluetooth: SCO socket layer initialized
clocksource: Switched to clocksource mxc_timer1
NET: Registered PF_INET protocol family
IP idents hash table entries: 2048 (order: 2, 16384 bytes, linear)
tcp_listen_portaddr_hash hash table entries: 5121024 (order: 0, 4096 bytes, linear)
Table-perturb hash table entries: 65536 (order: 6, 262144 bytes, linear)
TCP established hash table entries: 1024 (order: 0, 4096 bytes, linear)
TCP bind hash table entries: 1024 (order: 01, 40968192 bytes, linear)
TCP: Hash tables configured (established 1024 bind 1024)
UDP hash table entries: 256 (order: 0, 4096 bytes, linear)
UDP-Lite hash table entries: 256 (order: 0, 4096 bytes, linear)
NET: Registered PF_UNIX/PF_LOCAL protocol family
RPC: Registered named UNIX socket transport module.
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp-with-tls transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
Bus freq driver module loaded
Initialise system trusted keyrings
workingset: timestamp_bits=30 max_order=13 bucket_order=0
fuse: init (API version
7.34)
Key type asymmetric registered
Asymmetric key parser 'x509' registered
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 251249)
io scheduler mq-deadline registered
io scheduler kyber registered
40184000.serial: ttyLP0 io scheduler bfq registered
40184000.serial: ttyLP0 at MMIO 0x40184010 (irq = 17187, base_baud = 1250000) 
is a FSL_LPUART
fsl-lpuart 40184000.serial: Serial: Console lpuart rounded baud ratefrom  208333 to 115200
printk: console [ttyLP0] enabled
PPP generic driver version 2.4.2
PPP BSD Compression module registered
PPP Deflate Compression module registered
usbcore: registered new interface driver rt2800usb
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
usbcore: registered new interface driver cdc_acm
cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
usbcore: registered new interface driver uas
usbcore: registered new interface driver usb-storage
i2c_devsnvs_rtc 400d4000.snvs:snvs-rtc-lp: i2cregistered /devas entriesrtc0
driver
usbcoresnvs_rtc 400d4000.snvs:snvs-rtc-lp: registered setting system clock to 1970-01-01T00:24:36 UTC (1476)
i2c_dev: i2c /dev entries driver
usbcore: registered new interface driver btusb
sdhci: Secure Digital Host Controller Interface driver
sdhci: Copyright(c) Pierre Ossman
sdhci-pltfm: SDHCI platform and OF driver helper
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
NET: Registered PF_PACKET protocol family
mmc0Bluetooth: bounceRFCOMM upTTY to 128 segments into one, max segment size 65536 bytes
layer initialized
Bluetooth: RFCOMM TTYsocket layer initialized
Bluetooth: RFCOMM socketver layer initialized
Bluetooth: RFCOMM ver 1.11
ARMv7-M VFP coprocessor found
VFP: Double precision floating points are supported
Loading compiled-in X.509 certificates1.11
ARMv7-M VFP coprocessor found
VFP: Double precision floating points are supported
mmc0: SDHCI controller on 402c0000.mmc [402c0000.mmc] using ADMA
Loading compiled-in X.509 certificates
mmc0: new high speed SDHC card at address e624
mmcblk0: mmc0:e624 SB32G 29.7 GiB
mxs_phy 400d9000.usbphy: supply phy-3p0 not found, using dummy regulator
mxs_phy 400da000.usbphy: supply phy-3p0 not found, using dummy regulator
 mmcblk0: p1 p2
imx-lpi2c 403f0000.i2c: use pio mode
ft5x0x_ts 0-0038: resolution: 479x271
input: ft5x0x_ts as /devices/virtual/input/input0
ft5x0x_ts 0-0038: fft5x0x_i2c_Read: i2c read error.
[FTS] Firmware version = 0x5
ft5x0x_ts 0-0038: fft5x0x_i2c_Read: i2c read error.
[FTS] report rate is 50Hz.
ft5x0x_ts 0-0038: fft5x0x_i2c_Read: i2c read error.
[FTS] touch threshold is 20.
i2c i2c-0: LPI2C adapter registered
mxsfb 402b8000.lcdif: supply lcd not found, using dummy regulator
mxsfb 402b8000.lcdif: initialized
ci_hdrc ci_hdrc.1: EHCI Host Controller
ci_hdrc ci_hdrc.1: new USB bus registered, assigned bus number 1
mmc0: SDHCI controller on 402c0000.mmc [402c0000.mmc] using DMA
ci_hdrc ci_hdrc.1: USB 2.0 started, EHCI 1.00
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
input: gpio-keys as /devices/platform/gpio-keys/input/input0input1
cfg80211: Loading compiled-in X.509 certificates for regulatory database
cfg80211:
Loaded X.509 cert 'wens: 61c038651aabdcf94bd0ac7ff06c7248db18c600'
Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
platform regulatory.0: Direct firmware load for regulatory.db failed 
with error -2
clk: Disabling unused clocks
cfg80211: failed to load regulatory.db
Freeing unused kernel image (initmem) memory: 3544K3256K
This architecture does not have kernel memory protection.
Run /init as init process
[7151] Jan 01 00:0024:0137 Running in background
/ # mmc0: new high speed SDHC card at address 0007
mmcblk0: mmc0:0007 SD8GB 7.42 GiB
 mmcblk0: p1
Micrel KSZ8081 or KSZ8091 402d8000.ethernet-1:02: attached PHY driver  (mii_bus:phy_addr=402d8000.ethernet-1:02, irq=POLL)
fec 402d8000.ethernet eth0: Link is Up - 100Mbps/Full - flow control off

/ #

Let's test the TCP/IP stack on the i.MX RT1050.

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