[U-Boot] TFTP load for file over 50MB fails

[StephenPaulraj Chinnadurai-ERS,HCLTech]

-----Original Message-----
From: Wolfgang Denk [mailto:wd at denx.de] 
Sent: Thursday, September 02, 2010 1:51 PM
To: StephenPaulraj Chinnadurai-ERS,HCLTech
Cc: Marek Vasut; u-boot at lists.denx.de
Subject: Re: [U-Boot] TFTP load for file over 50MB fails

Dear "StephenPaulraj Chinnadurai-ERS,HCLTech",

In message <EC921D4B77C99B4EB3CEDAFFCF17D5F73DDED37343 at CHN-HCLT-EVS07.HCLT.CORP.HCL.IN> you wrote:
> 
> 1.  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.

> 2.  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

-- 
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
Always leave room to add an explanation if it doesn't work out.

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