-----Original Message----- From: Wolfgang Denk [mailto:wd@denx.de] Sent: Thursday, September 02, 2010 1:51 PM To: StephenPaulraj Chinnadurai-ERS,HCLTech Cc: Marek Vasut; u-boot@lists.denx.de Subject: Re: [U-Boot] TFTP load for file over 50MB fails
Dear "StephenPaulraj Chinnadurai-ERS,HCLTech",
In message EC921D4B77C99B4EB3CEDAFFCF17D5F73DDED37343@CHN-HCLT-EVS07.HCLT.CORP.HCL.IN you wrote:
- When the board is connected to network, through tftp the u-boot
is downloading only 9 MB size file. When tried to download 10 MB size file, the u-boot is displaying "Retry count exceeded; starting again" message and the file download is not getting completed.
Sounds like a instability of your hardware and/or U-Boot support for this board and/or platform.
- When the board is connected to Linux machine directly using
cross cable, through tftp the u-boot is downloading 47 MB size file without any retry, but when tried to download 53 MB size file, the u-boot is displaying "Retry count exceeded; starting again" message and download is not getting completed.
Are you aware of the restrictions of the TFTP protocol? In standard configuration, you can only load up to 32767 blocks of 512 bytes, i. e. not quite 16 MiB of data.
Most curent implementations treat the block number as unsigned, which shifts the limit to 32 MiB.
And if your TFTP server supports it you can also increase the block size.
Which exact settings are you using?
Previously the TFTP_MTU_BLOCKSIZE macro is assigned with the value 1468.
Now I changed the value of the TFTP_MTU_BLOCKSIZE macro to 512 in net/tftp.c file. #define TFTP_MTU_BLOCKSIZE 512
I installed tftp server in the windows XP PC and connect my hardware to the window XP PC through cross Ethernet cable. Now I can able to download files which are more than 50MB size.
But I can't download the files of 50MB size from the Linux PC with the same u-boot.bin image.
Whether I need to upgrade the tftp server running in the Linux PC?
Best regards,
Wolfgang Denk