Linux/AM5728: UART Boot failure

hi.
we review the url as you indicate and retry it. we have no difference with the url.
first, we wonder why we don't see "CCCC" at Tera Term or Minicom. our image have no problem(it is surely compiled with CONFIG_SPL_YMODEM_SUPPORT) and console settings is surely "115200 baud 8 stop bits no parity".
we tryed it with no - Software Flow control.

second, Y-modem with u-boot.img transfer is always failed. What is the problem ?

Thanks a lot.

Hi.

we   retry it  with none -> even on parity of console setting. However, we have the same problem.

I think that our evem board have any problem.

our compiled image  with CONFIG_SPL_YMODEM_SUPPORT as following it.

< u-boot.map >https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/791/u_2D00_boot.7z

.text.xyzModem_stream_open

               0x0000000080817424      0x170 common/built-in.o

               0x0000000080817424                xyzModem_stream_open

....

.text.load_serial_ymodem

               0x0000000080806ea0       0x90 cmd/built-in.o

..

Is it right ?

Thanks a lot.

Joonho,

I just tested on my AM572x EVM (rev A2) and I am able to boot the EVM from UART according to the instructions provided in the e2e thread I have sent to you in my previous reply.

Please double check the below points:

1. Modify u-boot/configs/am57xx_evm_defconfig file as below and build new u-boot-spl.bin and u-boot.img

+ CONFIG_SPL_YMODEM_SUPPORT=y

2. Open two consoles, one within u-boot/am57xx_evm/ folder and one withing your home directory.

In home directory console, execute "picocom -b 115200 /dev/ttyUSB0" and just monitor this console for now

In u-boot/am57xx_evm console, I execute the below command:

u-boot-2018.01/am57xx_evm$ perl serial-boot.pl -p /dev/ttyUSB0 -s spl/u-boot-spl.bin -d1 -t40

Then I have the below message:

----Please reset the Board NOW (timeout=40 sec)----

 

Then I power on the EVM and the u-boot-spl.bin transfer starts. At the end I have the below message:

spl/u-boot-spl.bin file download completed

 

At that time, the home directory console I start to see CCCCC stream. See the print screen attached:

3. In u-boot/am57xx_evm console I execute the below command:

u-boot-2018.01/am57xx_evm$ sx -kb --ymodem u-boot.img < /dev/ttyUSB0 > /dev/ttyUSB0
Sending: u-boot.img
Bytes Sent: 998784   BPS:10035                           
Sending:
Ymodem sectors/kbytes sent:   0/ 0k
Transfer complete

And I see u-boot.img is executed in the other console:

  ���bo���ro[HU�E�R�CC(STX)/0(CAN) packets, 5 retries
Loaded 998708 bytes


U-Boot 2018.01-00444-g17164f4a5d-dirty (Dec 12 2018 - 15:34:22 +0200)

CPU  : DRA752-GP ES1.1
Model: TI AM5728 BeagleBoard-X15
Board: AM572x EVM REV A.20
DRAM:  2 GiB
MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
GUID Partition Table Header signature is wrong: 0x0 != 0x5452415020494645
part_get_info_efi: *** ERROR: Invalid GPT ***
GUID Partition Table Header signature is wrong: 0x0 != 0x5452415020494645
part_get_info_efi: *** ERROR: Invalid Backup GPT ***
SCSI:  SATA link 0 timeout.
AHCI 0001.0300 32 slots 1 ports 3 Gbps 0x1 impl SATA mode
flags: 64bit ncq stag pm led clo only pmp pio slum part ccc apst
scanning bus for devices...
Found 0 device(s).
Net:   
Warning: ethernet@48484000 using MAC address from ROM
eth0: ethernet@48484000
Hit any key to stop autoboot:  0
MMC: no card present
MMC: no card present
MMC: no card present
MMC: no card present
Trying to boot Linux from eMMC ...
switch to partitions #0, OK
mmc1(part 0) is current device
SD/MMC found on device 1
** Unable to read file /boot/zImage **
Trying to boot Android from eMMC ...
switch to partitions #0, OK
mmc1(part 0) is current device

MMC read: dev # 1, block # 2263040, count 5208064 ...

Regards,
Pavel

Hi.

Thansk for your kindly answer.

we follow that you say. but, we  have same error( we don't see "CCCC").

we attach our print screen(console display on Ubuntu,  I think that you don't see console display very well, so we send cleared print screen.) 

At two print screen, When we send u-boot-spl.bin, Monitor of picocon displays "VA!:".

also, After we complete sending u-boot-spl.bin, Monitor of picon don't display "CCCC".

we attath our compiled image and config(tt2.7z : u-boot.img, u-boot-spl.bin, .config, am57xx_evm_defconfig). but, we surely compiled with CONFIG_SPL_YMODEM_SUPPORT.

we see xyxModem.o and spl_y_modem.o.

What's the problem ?

   < console display >

  < cleared print screen >

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/791/7266.tt2.7z

Hi.
we can see "CCC" through 7750.u-boot-spl.bin .
we have successed as follow it with 7750.u-boot-spl.bin .

root@ubunto-TI:~/AM5728_4.0/xxx/uart_boot# sx -kb --ymodem u-boot.img < /dev/ttyUSB0 > /dev/ttyUSB0
Sending: u-boot.img
Bytes Sent: 854656 BPS:9974
Sending:
Ymodem sectors/kbytes sent: 0/ 0k
Transfer complete

but, we don't see u-boot.img is executed successfully in the other console.

we can only see unknown characters as follow it.


€ÿ³)Ò0`b$U
ÀD(¢ @ÿ³)Ò0`b$U
@D(¢ €ü³)Ò0`b$U
€D(¢ € @ü³)Ò0`bU

@ @Q @ÿ³)Ò0`b$U
@D(¢ @ü³)Ò0`b$U
ÀD(¢ @ü³)Ò0`b$U
@D(¢ @ü³)Ò0`b$U
@Q @ÿ³)Ò0`b$U
ÀD(¢ @ü³)Ò0`b$U
ÀD(¢ @ü³)Ò0`b$U
ÀQ @ÿ



We've build u-boot.img with PSDK4.x(ti-processor-sdk-linux-am57xx-evm-04.00.00.04). So this problem happen ?

Thanks a lot.

Joonho,

Glad to see you have fixed your issue now.

Regards,
Pavel

Hi. Pavel.
TI PSDK have no any problem for uart boot.

It(uart boot failure) have our problem.
our uboot source changed from uart3 to uart10 before 1 years.
Change of this uart cause uart boot failure.
I am so sorry that we didnt realize it(uart change).

Thanks you very much for many help.
TI PSDK is very so good ....