Hello,
We are using arm926ejs based custom board. We are able to get u-boot prompt using BDI2000. We are also able to get Linux prompt using BDI. The serial console is working fine for both the cases.
Now we want to run Linux from u-boot prompt (using bootm ). We got the u-boot prompt by running u-boot using BDI2K. Then we use kermit to transfer uImage to suitable memory location and execute bootm command.
When we execute "bootm 0x5000000" command it gives the "Starting kernel ...". After that nothing is printed in the serial console. We have verified "http://www.denx.de/wiki/view/DULG/LinuxPostMortemAnalysis" that "__log_buf" gives the exact booting sequences what we used to get when running vmlinux.bin from BDI.
****LOG START******
TEST # loadb 0x5000000 ## Ready for binary (kermit) download to 0x05000000 at 38400 bps... ## Total Size = 0x0012db0f = 1235727 Bytes ## Start Addr = 0x05000000 TEST # bootm 0x5000000 ## Booting kernel from Legacy Image at 05000000 ... Image Name: TEST Kernel Image Image Type: ARM Linux Kernel Image (gzip compressed) Data Size: 1235663 Bytes = 1.2 MB Load Address: 02000000 Entry Point: 02000000 Uncompressing Kernel Image ... OK
Starting kernel ...
*****LOG END*****
I use "console=ttyS0,38400n8" as boot option in Linux. The same console option gives the serial port data when we execute vmlinux.bin using BDI.
The brief memory map is like this The SDRAM starts at 0x00000000 (total 256 MB) u-boot load address is 0x00100000 uImage load address is 0x05000000 Kernel Load Address/Entry Point : 0x02000000 ( I use mkimage tool to generate uImage from vmlinux, the command I use is mkimage -A arm -O linux -T kernel -C gzip -a 0x2000000 -e 0x2000000 -n "TEST Kernel Image" -d vmlinux.bin.gz uImage")
Pls help me where should I investigate to get Linux serial data.
Thanks in advance.
Regards, Batsayan Das Tata Consultancy Services Mailto: batsayan.das@tcs.com Website: http://www.tcs.com ____________________________________________ Experience certainty. IT Services Business Solutions Outsourcing ____________________________________________ =====-----=====-----===== Notice: The information contained in this e-mail message and/or attachments to it may contain confidential or privileged information. If you are not the intended recipient, any dissemination, use, review, distribution, printing or copying of the information contained in this e-mail message and/or attachments to it are strictly prohibited. If you have received this communication in error, please notify us by reply e-mail or telephone and immediately and permanently delete the message and any attachments. Thank you