[U-Boot] fatwrite problem

[Tom Rini <trini@ti.com>]

On Fri, Apr 12, 2013 at 05:06:35PM +0200, Ruud Commandeur wrote:
> Hi Mats,
> 
> Thanks a lot, this seems to solve my problem. Nothing more actualy than adding a "if(size)" around the code block of set_sector( ). I could have thought of that myself, but was not sure if anything else should be done in this case...

Since your change sounds slightly different, can you confirm that it
also solves the problem and if so post it as patch with Signed-off-by
and so forth?  Thanks!

> 
> Regards,
> 
> Ruud 
> 
> -----Oorspronkelijk bericht-----
> Van: Mats K?rrman [mailto:Mats.Karrman at tritech.se] 
> Verzonden: vrijdag 12 april 2013 16:11
> Aan: Ruud Commandeur
> CC: u-boot at lists.denx.de
> Onderwerp: RE: fatwrite problem
> 
> Hi Ruud,
> 
> Ruud Commandeur wrote:
> > Once the size of the set_cluster call equals 0, the mmc command is
> > incomplete and times out. In the earlier reported problem, a patch is
> > mentioned, but not available for dowload here. Also in the latest
> > versions of the git repository I could not find a patch for this
> > problem. Can anyone tell me if there is a fix for this problem?
> 
> I asked Damien Huang (back then) and got the following reply (I think there was
> some character encoding problem so his mail never was accepted by the list).
> I have not further analyzed the contents, anyway it wasn't the solution to my problem.
> BR // Mats
> 
> Damien Huang wrote:
> As requested from Mats, I am resending this email. The patch is given below:
> 
> diff -cr ./u-boot-original/u-boot/fs/fat/fat_write.c ./u-boot-test/u-boot/fs/fat/fat_write.c
> *** ./u-boot-original/u-boot/fs/fat/fat_write.c    2013-02-07 14:47:33.314732999 +1100
> --- ./u-boot-test/u-boot/fs/fat/fat_write.c    2013-02-28 15:36:24.551861920 +1100
> ***************
> *** 562,596 ****
>   {
>       int idx = 0;
>       __u32 startsect;
> !
> !     if (clustnum > 0)
> !         startsect = mydata->data_begin +
> !                 clustnum * mydata->clust_size;
> !     else
> !         startsect = mydata->rootdir_sect;
> !
> !     debug("clustnum: %d, startsect: %d\n", clustnum, startsect);
> !
> !     if (disk_write(startsect, size / mydata->sect_size, buffer) < 0) {
> !         debug("Error writing data\n");
> !         return -1;
> !     }
> !
> !     if (size % mydata->sect_size) {
> !         __u8 tmpbuf[mydata->sect_size];
> !
> !         idx = size / mydata->sect_size;
> !         buffer += idx * mydata->sect_size;
> !         memcpy(tmpbuf, buffer, size % mydata->sect_size);
> !
> !         if (disk_write(startsect + idx, 1, tmpbuf) < 0) {
> !             debug("Error writing data\n");
> !             return -1;
> !         }
> !
> !         return 0;
> !     }
> !
>       return 0;
>   }
>  
> --- 562,595 ----
>   {
>       int idx = 0;
>       __u32 startsect;
> !     if(size) //if there are data to be set
> !     {
> !         if (clustnum > 0)
> !             startsect = mydata->data_begin +
> !                     clustnum * mydata->clust_size;
> !         else
> !             startsect = mydata->rootdir_sect;
> !
> !         debug("clustnum: %d, startsect: %d\n", clustnum, startsect);
> !
> !         if (disk_write(startsect, size / mydata->sect_size, buffer) < 0) {
> !             debug("Error writing data\n");
> !             return -1;
> !         }
> !
> !         if (size % mydata->sect_size) {
> !             __u8 tmpbuf[mydata->sect_size];
> !
> !             idx = size / mydata->sect_size;
> !             buffer += idx * mydata->sect_size;
> !             memcpy(tmpbuf, buffer, size % mydata->sect_size);
> !
> !             if (disk_write(startsect + idx, 1, tmpbuf) < 0) {
> !                 debug("Error writing data\n");
> !                 return -1;
> !             }
> !         }
> !     }//end if data to be set
>       return 0;
>   }
>  
> diff -cr ./u-boot-original/u-boot/include/configs/am335x_evm.h ./u-boot-test/u-boot/include/configs/am335x_evm.h
> *** ./u-boot-original/u-boot/include/configs/am335x_evm.h    2013-02-07 14:47:35.754702325 +1100
> --- ./u-boot-test/u-boot/include/configs/am335x_evm.h    2013-03-01 12:25:23.942104474 +1100
> ***************
> *** 143,148 ****
> --- 143,149 ----
>   #define CONFIG_CMD_MMC
>   #define CONFIG_DOS_PARTITION
>   #define CONFIG_FS_FAT
> + #define CONFIG_FAT_WRITE
>   #define CONFIG_FS_EXT4
>   #define CONFIG_CMD_FAT
>   #define CONFIG_CMD_EXT2

Benoit, what do you think?  Thanks!

-- 
Tom
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