fitImage align 8-byte for ARM64【请注意，邮件由u-boot-bounces at lists.denx.de代发】

[Tom Rini]

On Tue, Jan 07, 2020 at 09:25:53AM +0800, Kever Yang wrote:
> Hi Tom, Simon,
> 
> 
> On 2020/1/6 下午10:20, Tom Rini wrote:
> > On Mon, Jan 06, 2020 at 01:47:25PM +0100, Matthias Schoepfer wrote:
> > 
> > > Hi!
> > > 
> > > I have had trouble booting a fitImage packed kernel for dragonboard410c,
> > > which is an ARM64 platform. After days and days of debugging, I found that
> > > the fdt is 4-byte aligned. But within the linux kernel,
> > > Documentation/arm64/booting.txt says, fdt must be 8 byte aligned.
> > > 
> > > If I change the alignment by means of fdt_high, the Kernel boots, otherwise,
> > > it hangs.
> > > 
> > > Is there an option to align the fitImage to 8-byte boundaries, and if not,
> > > is it feasible to submit a patch or will this never have a chance to get
> > > merged?!
> > That's interesting.  It sounds like you need to look at
> > boot_relocate_fdt() perhaps?  Thanks!
> > 
> When I use the FIT image, I met another issue:
> 
> - The emmc/sd read is by block which is 512byte;
> 
> - The FIT image header is always not 512byte align, and the entry of
> 
>   image in FIT is always not aligned to block;
> 
> - The image read from block device always need memory coppy which
> 
>   make it slow.
> 
> I can truncate the image in FIT align to 512 byte, but not able to make the
> 
> header which is dtb 512byte align,  any idea to implement this?

I don't quite follow, sorry.  Don't you control where the image will be
written to in eMMC?

-- 
Tom
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