Oh I see. Thanks.
On Tue, Feb 16, 2016 at 8:41 AM, Stephen Warren swarren@wwwdotorg.org wrote:
On 02/16/2016 09:01 AM, Simon Glass wrote:
+Stephen who will know more
Hi,
On 13 February 2016 at 18:52, quantumlight peter.feifan.chen@gmail.com wrote:
I am trying to modify the bootloader code for NVIDIA's jetson board.
So I am looking at crt0.S. It seems that two builds happen, one with CONFIG_SPL_BUILD and one without. So you end up with two file, u-boot.bin and spl/u-boot-spl.bin.
SPL is built with ARMv4t U-Boot proper is built with ARMv7
That's why SPL is used on Tegra. The SPL does not actually load U-Boot. In fact both are bundle together and loaded at the same time. SPL simply jumps to U-Boot when needed.
There's some more background on this topic at:
ftp://download.nvidia.com/tegra-public-appnotes/index.html
In particular, see the "Tegra Boot Flow" link/document.