[U-Boot-Users] Reading mediacard compressed files
Hi All, I have a media card that has one fat partition with a testfile.gzip (unrelated to the kernel). I would like to read this file and uncompress it to SD memory. Can this be done and if so, how do I achieve this? I've enabled FAT support but fatinfo requires "dev[:part]" and I'm not sure what to specify as my device and partition.
Thanks, --Jr.
"Junior" ejr@inbox.com wrote in message news:331ACB2C846.00000166ejr@inbox.com...
Hi All, I have a media card that has one fat partition with a testfile.gzip (unrelated to the kernel). I would like to read this file and uncompress it to SD memory. Can this be done and if so, how do I achieve this? I've enabled FAT support but fatinfo requires "dev[:part]" and I'm not sure what to specify as my device and partition.
Typically "fatinfo mmc 0". The command is of the format "fatinfo <interface> <dev[:part]>"
Interface is important for common/cmd_fat.c function get_dev() where it calls a different function for each name. It passes the device number to a function mmc_get_dev which is probably in your cpu-specific files unless something has changed since 1.1.5. My at91 mmc/sd implementation is quite simple because I only support one device. I completely ignore the dev parameter and return a pointer for the only device available on my system.
-joey
-----Original Message----- From: joravec@drewtech.com Sent: Fri, 13 Jul 2007 11:10:14 -0400 To: u-boot-users@lists.sourceforge.net Subject: Re: [U-Boot-Users] Reading mediacard compressed files
"Junior" ejr@inbox.com wrote in message news:331ACB2C846.00000166ejr@inbox.com...
Hi All, I have a media card that has one fat partition with a testfile.gzip (unrelated to the kernel). I would like to read this file and uncompress it to SD memory. Can this be done and if so, how do I achieve this? I've enabled FAT support but fatinfo requires "dev[:part]" and I'm not sure what to specify as my device and partition.
Typically "fatinfo mmc 0". The command is of the format "fatinfo
Thanks, That did it: Partition 1: Filesystem: FAT32 "NO NAME "
But how do I read from this partition then do an uncompress?
<interface> <dev[:part]>"
Interface is important for common/cmd_fat.c function get_dev() where it calls a different function for each name. It passes the device number to a function mmc_get_dev which is probably in your cpu-specific files unless something has changed since 1.1.5. My at91 mmc/sd implementation is quite simple because I only support one device. I completely ignore the dev parameter and return a pointer for the only device available on my system.
-joey
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"Junior" ejr@inbox.com wrote in message news:335F22A093A.000001A1ejr@inbox.com...
Thanks, That did it: Partition 1: Filesystem: FAT32 "NO NAME "
But how do I read from this partition then do an uncompress?
You probably already have gunzip() available because it's in common/cmd_bootm.c. If you want to do this from the command line you'll probably need to add a new u-boot command. Check common/cmd_fat.c for examples of the U_BOOT_CMD() macro and doc/README.commands for instructions.
There are a few examples of gunzip within common/cmd_lcd.c for displaying a compressed bitmap. Usually it's just done from code.
-joey
Junior wrote:
-----Original Message----- From: joravec@drewtech.com Sent: Fri, 13 Jul 2007 11:10:14 -0400 To: u-boot-users@lists.sourceforge.net Subject: Re: [U-Boot-Users] Reading mediacard compressed files
"Junior" ejr@inbox.com wrote in message news:331ACB2C846.00000166ejr@inbox.com...
Hi All, I have a media card that has one fat partition with a testfile.gzip (unrelated to the kernel). I would like to read this file and uncompress it to SD memory. Can this be done and if so, how do I achieve this? I've enabled FAT support but fatinfo requires "dev[:part]" and I'm not sure what to specify as my device and partition.
Typically "fatinfo mmc 0". The command is of the format "fatinfo
Thanks, That did it: Partition 1: Filesystem: FAT32 "NO NAME "
But how do I read from this partition then do an uncompress?
Hi Junior,
Your original message says "uncompress it to SD memory." If you are expecting to write the resulting data back to your media card (my interpretation of "SD memory"), I don't think you can get there without a lot of work.
IIRC, the file systems supported by u-boot are read-only. The expectation is that, if you want to write to a file system, you should us an operating system, not a boot loader.
gvb
-----Original Message----- From: gerald.vanbaren@smiths-aerospace.com Sent: Fri, 13 Jul 2007 11:41:34 -0400 To: ejr@inbox.com Subject: Re: [U-Boot-Users] Reading mediacard compressed files
Junior wrote:
-----Original Message----- From: joravec@drewtech.com Sent: Fri, 13 Jul 2007 11:10:14 -0400 To: u-boot-users@lists.sourceforge.net Subject: Re: [U-Boot-Users] Reading mediacard compressed files
"Junior" ejr@inbox.com wrote in message news:331ACB2C846.00000166ejr@inbox.com...
Hi All, I have a media card that has one fat partition with a testfile.gzip (unrelated to the kernel). I would like to read this file and uncompress it to SD memory. Can this be done and if so, how do I achieve this? I've enabled FAT support but fatinfo requires "dev[:part]" and I'm not sure what to specify as my device and partition.
Typically "fatinfo mmc 0". The command is of the format "fatinfo
Thanks, That did it: Partition 1: Filesystem: FAT32 "NO NAME "
But how do I read from this partition then do an uncompress?
Hi Junior,
Your original message says "uncompress it to SD memory." If you are expecting to write the resulting data back to your media card (my interpretation of "SD memory"), I don't think you can get there without a lot of work.
IIRC, the file systems supported by u-boot are read-only. The expectation is that, if you want to write to a file system, you should us an operating system, not a boot loader.
I'm sorry, By SD I really ment SDRAM. Perhaps I shouls simply say "uncompress". I have 32M of ram and I'm trying to read a file into ram and uncompress it. I'm not interested in writing to the media card.
Thanks, --Jr.
gvb
participants (3)
-
Jerry Van Baren -
Joey Oravec -
Junior