[Buildroot] [PATCH 2/4] nitrogen6x: use 6x_bootscript/6x_upgrade instead of older 6q_ versions

[Peter Korsgaard]

>>>>> "Eric" == Eric Nelson <eric.nelson at boundarydevices.com> writes:

Hi Eric,

 >> - Comparing 6q_upgrade and 6x_upgrade I see we used to write the raw
 >> u-boot.bin to offset 0 in the spi flash, and now are writing
 >> u-boot.imx (which presumably is u-boot.bin with a freescale header) to
 >> offset 1K. I see that the .imx file is 4K bigger than the .bin
 >> file, so that's presumably the size of the freescale header.
 >> 
 Eric> The switch from "u-boot.bin" to "u-boot.imx" occurred when we
 Eric> switched from using a Freescale-derived U-Boot 2009.08 to
 Eric> main-line U-Boot sources (currently 2013.07).

Ahh, I guess the confusion comes from the fact that I missed the change
to u-boot.imx when I updated the u-boot version back in April:

http://git.buildroot.net/buildroot/commit/configs/nitrogen6x_defconfig?id=184850a4239c967742


 Eric> Details in this post:
 Eric> 	http://boundarydevices.com/switching-u-boot-versions-on-i-mx6/

 >> I'll go and add a option for u-boot.imx to the u-boot package, but would
 >> like to hear if 6x_upgrade is doing the right thing here.
 >> 
 Eric> A short description of the change is that Freescale's build process
 Eric> generated u-boot.bin with 512 bytes of padding at the beginning,
 Eric> while main-line U-Boot generates u-boot.imx without the padding.

I guess you mean 1K of padding to match the new script?

hexdump -C u-boot.bin|head   /tmp/boundarydevices-u-boot-2009-08-1f7edab
00000000  c6 01 00 ea 00 00 00 00  00 00 00 00 00 00 00 00  |................|
00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000400  d1 00 20 40 20 07 80 27  00 00 00 00 2c 04 80 27  |.. @ ..'....,..'|
00000410  20 04 80 27 00 04 80 27  00 00 00 00 00 00 00 00  | ..'...'........|
00000420  00 00 80 27 74 30 03 00  00 00 00 00 d2 02 f0 40  |...'t0.........@|
00000430  cc 02 ec 04 02 0e 05 a8  00 00 00 30 02 0e 05 b0  |...........0....|
00000440  00 00 00 30 02 0e 05 24  00 00 00 30 02 0e 05 1c  |...0...$...0....|
00000450  00 00 00 30 02 0e 05 18  00 00 00 30 02 0e 05 0c  |...0.......0....|
00000460  00 00 00 30 02 0e 05 b8  00 00 00 30 02 0e 05 c0  |...0.......0....|


 Eric> There are also a handful of discrepancies in the syntax for
 Eric> various commands between the two versions, especially in the
 Eric> areas of SPI NOR (sf probe command), which prompted us to switch
 Eric> the name of the upgrade script (6q_upgrade == old/6x_upgrade == new)
 Eric> when switching to main-line based code.

 Eric> Note that unlike many ARM-based boards out there, our devices boot
 Eric> to SPI-NOR, so building U-Boot is a convenience. It's not needed
 Eric> to build an SD card image and the choice of when to upgrade should
 Eric> largely be based on the need for features or bug fixes and not
 Eric> tied to each userspace build.

Yes, I know. My nitrogen6x board still runs the original 2009.08
bootloader it was shipped with (which has problems using ext2 rev0
filesystems among others), so I should probably upgrade ;)

Thanks for the info.
-- 
Bye, Peter Korsgaard