Re: [U-Boot] Problems around fatwrite command from uboot

1 Mar 2013

      Hi Damien,
I see there are other set_cluster() uses and then your test of size=0 is
certainly at the good place.
It remains  for me to try to reproduce the "Invalid FAT entry" on one SD
(my first post) and test to reboot it with the new version patched uboot to
see if the new write of file doesn't block.
Thank you for your help.
----
2013/3/1 Damien HUANG 黄卫 damienwei@hotmail.com
...
Why the size equals zero? it is coming from the same file, but within
function "set_contents". look the below codes
    actsize = bytesperclust;
    ...
    ...

    /* actsize >= file size */
    actsize -= bytesperclust;
    /* set remaining clusters */
    if (set_cluster(mydata, curclust, buffer, (int)actsize) != 0) {
        debug("error: writing cluster\n");
        return -1;
    }

Cheers,

From: 1978.jl@gmail.com
Date: Thu, 28 Feb 2013 12:21:53 +0100
Subject: Re: [U-Boot] Problems around fatwrite command from uboot
To: damienwei@hotmail.com
CC: scott@jumpnowtek.com; u-boot@lists.denx.de; sean@bcodeme.com
Hi,
I confirm that your patch correct my problem and the bug disappear.
The question is : why (or when) the size equals zero ?
Thank you Damien.

2013/2/28 Damien HUANG 黄卫 damienwei@hotmail.com
Hi,
You received this email, because you had recently experienced fatwrite
issue with uboot.
The symptom of the problem is at the time of calling fatwrite to write a
block of data to file, the below message would be shown, despite the
message saying "xxxx bytes written" at the end, however, there was not data
being actually stored.
...

mmc_send_cmd: timedout waiting on cmd inhibit to clear*>* mmc_send_cmd: timedout waiting on cmd inhibit to clear*>* mmc_send_cmd: timedout waiting on cmd inhibit to clear*>* mmc_send_cmd: timedout waiting on cmd inhibit to clear*>* mmc_send_cmd: timedout waiting on cmd inhibit to clear*>* mmc_send_cmd: timedout waiting on cmd inhibit to clear*>* mmc_send_cmd: timedout waiting on cmd inhibit to clear*>* mmc_send_cmd: timedout waiting on cmd inhibit to clear*>* mmc_send_cmd: timedout waiting on cmd inhibit to clear*>* mmc_send_cmd: timedout waiting on cmd inhibit to clear*>* mmc_send_cmd: timedout waiting on cmd inhibit to clear

*>* 42428 bytes written*
After investigation, I believe the problem can be fixed at function
"set_cluster" within file fat_write.c under directory /fs/fat (patch file
was attached).
The reason of the issue is: If function "set_cluster" was called with size
equals ZERO, then the function would only issue the write instruction to
MMC driver without data, this caused the MMC to be in a wait state for data
and inhibiting further commands. As all subsequent commands to MMC would
first check whether MMC is in inhibit state before actual command being
issued, this check would always fail and time out occur, so the above
message being displayed.
Cheers,
Damien

From: 1978.jl@gmail.com
Date: Wed, 27 Feb 2013 09:02:42 +0100
Subject: Re: [U-Boot] Problems around fatwrite command from uboot
To: damienwei@hotmail.com
Hi Damien,
I have only patched as I say on :
http://lists.denx.de/pipermail/u-boot/2013-February/147407.html
I have no more changes for the moment.
Bye.

2013/2/27 Damien HUANG 黄卫 damienwei@hotmail.com
Hi Jean,
I saw your post in regard to the issue of fatwrite command from uboot. As
I am also experienced with such an error, I am wonder if you got the
problem fixed? If so, please share your success.
Cheers,
Damien

Re: [U-Boot] Problems around fatwrite command from uboot

Jean Louis