OpenWrt/LEDE Project

  • Status Unconfirmed
  • Percent Complete
    0%
  • Task Type Bug Report
  • Category Base system
  • Assigned To No-one
  • Operating System All
  • Severity Low
  • Priority Very Low
  • Reported Version Trunk
  • Due in Version Undecided
  • Due Date Undecided
  • Private
Attached to Project: OpenWrt/LEDE Project
Opened by João Chainho - 13.03.2017

FS#623 - ar71xx: RB750UPr2: No serial console

Hello,
The serial console isn’t working on MikroTik RB750UPr2 (NOR flash) (normal boot). Netboot is fine though. Notice no-uart in the kernel command line args.
Tested with recent snapshots (r3607-d49ddcd, r3617-f9da623)

Netboot

[    0.000000] Linux version 4.4.52 (buildbot@builds) (gcc version 5.4.0 (LEDE GCC 5.4.0 r3607-d49ddcd) ) #0 Wed Mar 8 18:06:04 2017
[    0.000000] bootconsole [early0] enabled
...
[    0.000000] Kernel command line: no-uart no-nand parts=1 boot_part_size=16777216 gpio=8525375 HZ=325000000 mem=64M kmac=E4:8D:8C:99:18:31 board=750-hb hw_opt=0008400D boot=0 mlc=8 console=ttyS0,115200 rootfstype=squashfs noinitrd
...
[    0.125208] MIPS: machine is MikroTik RouterBOARD 750UP r2
...
[    2.957103] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
[    2.967151] console [ttyS0] disabled
[    2.991360] serial8250.0: ttyS0 at MMIO 0x18020000 (irq = 11, base_baud = 1562500) is a 16550A
[    3.001161] console [ttyS0] enabled
[    3.001161] console [ttyS0] enabled
[    3.008713] bootconsole [early0] disabled
[    3.008713] bootconsole [early0] disabled
[    3.023066] m25p80 spi0.0: found w25q128, expected m25p80
[    3.028744] m25p80 spi0.0: w25q128 (16384 Kbytes)
[    3.033619] Creating 6 MTD partitions on "spi0.0":
[    3.038569] 0x000000000000-0x00000000e000 : "routerboot"
[    3.046718] 0x00000000e000-0x00000000f000 : "hard_config"
[    3.054081] 0x00000000f000-0x000000010000 : "bios"
[    3.060744] 0x000000010000-0x00000001f000 : "routerboot2"
[    3.068174] 0x00000001f000-0x000000020000 : "soft_config"
[    3.075587] 0x000000020000-0x000001000000 : "firmware"

Normal boot

[    0.000000] Linux version 4.4.52 (buildbot@buildslave) (gcc version 5.4.0 (LEDE GCC 5.4.0 r3617-f9da623) ) #0 Fri Mar 10 00:23:50 2017
[    0.000000] bootconsole [early0] enabled
...
[    0.000000] Kernel command line: no-uart no-nand parts=1 boot_part_size=16777216 gpio=0 HZ=325000000 mem=64M kmac=E4:8D:8C:99:18:31 board=750-hb Board=750-hb ver=3.36 hw_opt=0008400D boot=1 mlc=10 console=ttyS0,115200 rootfstype=squashfs noinitrd
...
[    0.125275] MIPS: machine is MikroTik RouterBOARD 750UP r2
...
[    0.696259] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
[    0.706324] console [ttyS0] disabled
[    0.730536] serial8250.0: ttyS0 at MMIO 0x18020000 (irq = 11, base_baud = 1562500) is a 16550A
[    0.740339] console [ttyS0] enabled
[    0.747890] bootconsole [early0] disabled
[    0.762167] m25p80 spi0.0: found w25q128, expected m25p80
[    0.767840] m25p80 spi0.0: w25q128 (16384 Kbytes)
[    0.772706] Creating 6 MTD partitions on "spi0.0":
[    0.777667] 0x000000000000-0x00000000e000 : "routerboot"
[    0.785835] 0x00000000e000-0x00000000f000 : "hard_config"
[    0.793114] 0x00000000f000-0x000000010000 : "bios"
[    0.799850] 0x000000010000-0x00000001f000 : "routerboot2"
[    0.807243] 0x00000001f000-0x000000020000 : "soft_config"
[    0.814630] 0x000000020000-0x000001000000 : "firmware"
[    0.865054] 2 minor-fw partitions found on MTD device firmware
[    0.871104] 0x000000020000-0x0000001a0000 : "kernel"
[    0.877734] 0x0000001a0000-0x000001000000 : "rootfs"
[    0.884687] mtd: device 7 (rootfs) set to be root filesystem
[    0.890584] 1 squashfs-split partitions found on MTD device rootfs
[    0.897035] 0x000000390000-0x000001000000 : "rootfs_data"

BTW the serial console is working fine on RB750UP (NAND flash) (normal boot).

[    0.000000] Kernel command line: parts=1 boot_part_size=4194304 gpio=790343 HZ=200000000 mem=32M kmac=D4:CA:6D:91:86:F1 board=750i Board=750i ver=3.33 hw_opt=0000000D boot=1 mlc=10 console=ttyS0,115200 rootfstype=squashfs noinitrd

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