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Old 11-30-2012, 04:21 PM   #1
giorgio130
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U-boot with fastboot support for k3

Hi everyone! I'm trying to port the u-boot found in newer kindles, with fastboot support, to the kindle 3. Next step will be to remove the image size limitation to flash also the system partition.
I've got a first release that compiles fine, but I'm unsure of how to test this.
Source and a binary are attached to this thread, so directions and/or testers are welcome
Attached Files
File Type: gz uboot_kindle3_fastboot.tar.bz2.gz (9.57 MB, 249 views)

Last edited by giorgio130; 11-30-2012 at 04:34 PM.
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Old 11-30-2012, 04:49 PM   #2
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Quote:
Originally Posted by giorgio130 View Post
Hi everyone! I'm trying to port the u-boot found in newer kindles, with fastboot support, to the kindle 3. Next step will be to remove the image size limitation to flash also the system partition.
Size of flashed image in fastboot mode on newer Kindles is limited by RAM size only (minus some MB for U-Boot itself and system buffers). But, for example, KT has 256MB RAM and KT's rootfs on system partition (/dev/mmcblk0p1) is about 340MB: that's why rootfs image can be flashed in fastboot mode only partially. It's understandable limitation inherited from standard fastboot.

So, to clarify things, you can't just "remove" size limitation. You'll need to implement new fastboot command for "chunked" downloading and flashing of "big" images. And change fastboot tool to support this new command.
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Old 11-30-2012, 05:08 PM   #3
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And while adding features to fastboot protocol, how about adding remote debugging and an mmc hex editor?
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Old 12-01-2012, 04:43 AM   #4
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Quote:
Originally Posted by eureka View Post
Size of flashed image in fastboot mode on newer Kindles is limited by RAM size only (minus some MB for U-Boot itself and system buffers). But, for example, KT has 256MB RAM and KT's rootfs on system partition (/dev/mmcblk0p1) is about 340MB: that's why rootfs image can be flashed in fastboot mode only partially. It's understandable limitation inherited from standard fastboot.

So, to clarify things, you can't just "remove" size limitation. You'll need to implement new fastboot command for "chunked" downloading and flashing of "big" images. And change fastboot tool to support this new command.
Thanks for the explanation, I couldn't find the cause anywhere. But I actually think that android phones don't have this kind of limitation... Or maybe they just keep their partition size under the amount of available ram?
I'll do some research. BTW, do you know if the limit of 72 kb for the first-stage u-boot applies even to the kindle 3? I didn't find any reference to a "bist" u-boot on this platform, so I'd assume no...
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Old 12-01-2012, 09:34 AM   #5
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Quote:
Originally Posted by giorgio130 View Post
Thanks for the explanation, I couldn't find the cause anywhere.
It's at include/configs/imx50_yoshi_bist.h:
Code:
#define CONFIG_FASTBOOT_MAX_DOWNLOAD_LEN  ((get_dram_size()) - (2*1024*1024) - (CONFIG_FASTBOOT_TEMP_BUFFER - CONFIG_SYS_SDRAM_BASE))
Quote:
Originally Posted by giorgio130 View Post
But I actually think that android phones don't have this kind of limitation... Or maybe they just keep their partition size under the amount of available ram?
Exactly.

Quote:
Originally Posted by giorgio130 View Post
I'll do some research. BTW, do you know if the limit of 72 kb for the first-stage u-boot applies even to the kindle 3? I didn't find any reference to a "bist" u-boot on this platform, so I'd assume no...
I can't answer, I don't know. 72kb limit was found by reading of Reference Manual for Kindle Touch SoC. I think you should read similar manual for K3 SoC.
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