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LS1020A no work UART Rx

Question asked by Ilya Minaev on May 22, 2018
Latest reply on May 23, 2018 by Pavel Chubakov

I'm trying to revive my motherboard with the processor LS1020A. I tried to start the operating system for the Tower Board, but it hangs randomly. Often hangs on the "startings of the kernel". Sometimes it is loaded with a Ubuntu wire, but then hangs randomly. Then I decided to download a small operating system RootFS. It is always loaded to the command line. But it does not react to my commands from uart. The converter works fine. Next, I bring the log from the debug board, where everything works, on my board. My circuit is different from the debugging board. I have otherwise connected Ethernet, there is no memory.

 

Original

U-Boot SPL 2015.01+ls1+g3281947 (Aug 18 2015 - 10:45:02)
U-Boot 2015.01+ls1+g3281947 (Aug 18 2015 - 10:45:02)
CPU: Freescale LayerScape LS1021E, Version: 2.0, (0x87081120)
Clock Configuration:
CPU0(ARMV7):1000 MHz,
Bus:300 MHz, DDR:800 MHz (1600 MT/s data rate),
Reset Configuration Word (RCW):
00000000: 0608000a 00000000 00000000 00000000
00000010: 70000000 00007900 e0025a00 21046000
00000020: 00000000 00000000 00000000 20000000
00000030: 00080000 881b7340 00000000 00000000
Board: LS1021ATWR
CPLD: V2.0
PCBA: V1.0
VBank: 0
I2C: ready
DRAM: 1 GiB
Using SERDES1 Protocol: 112 (0x70)
Flash: 128 MiB
MMC: FSL_SDHC: 0
PCIe1: Root Complex no link, regs @ 0x3400000
PCIe2: Root Complex no link, regs @ 0x3500000
In: serial
Out: serial
Err: serial
SEC0: RNG instantiated
SATA link 0 timeout.
AHCI 1.03 1 slots 1 ports ? Gbps 0x1 impl SATA mode
flags: 64bit ncq pm clo only pmp fbss pio slum part ccc
scanning bus for devices...
Found 0 device(s).
SCSI: Net: eTSEC2 is in sgmii mode.
eTSEC1 [PRIME], eTSEC2, eTSEC3

 

 

my board

U-Boot SPL 2015.01+ls1+g3281947 (Aug 18 2015 - 10:45:02)


U-Boot 2015.01+ls1+g3281947 (Aug 18 2015 - 10:45:02)

CPU: Freescale LayerScape LS1020, Version: 2.0, (0x87001020)
Clock Configuration:
CPU0(ARMV7):1000 MHz,
Bus:300 MHz, DDR:800 MHz (1600 MT/s data rate),
Reset Configuration Word (RCW):
00000000: 0608000a 00000000 00000000 00000000
00000010: 70000000 00007900 e0025a00 21046000
00000020: 00000000 00000000 00000000 20000000
00000030: 00080000 881b7340 00000000 00000000
Board: LS1021ATWR
CPLD: Vff.ff
PCBA: Vff.0
VBank: 1
I2C: ready
DRAM: 1 GiB
Using SERDES1 Protocol: 112 (0x70)
Flash: 0 Bytes
MMC: FSL_SDHC: 0
PCIe1: Root Complex no link, regs @ 0x3400000
PCIe2: Root Complex no link, regs @ 0x3500000
In: serial
Out: serial
Err: serial
SATA link 0 timeout.
AHCI 0001.0300 1 slots 1 ports ? Gbps 0x1 impl SATA mode
flags: 64bit ncq pm clo only pmp fbss pio slum part ccc
scanning bus for devices...
Found 0 device(s).
SCSI: Net: eTSEC2 is in sgmii mode.
Phy 2 not found
PHY reset timed out
Phy 1 not found
PHY reset timed out
eTSEC1 [PRIME], eTSEC2, eTSEC3
=>

Outcomes