[PATCH] sunxi-common: support loading compressed kernel images on ARMv8

[Andre Przywara <andre.przywara@arm.com>]

On Sat, 17 Apr 2021 12:47:23 -0500
Samuel Holland <samuel@sholland.org> wrote:

Hi Samuel,

> On 3/31/21 10:39 AM, Andre Przywara wrote:
> > On 20/02/2021 12:14, Nicolas Boulenguez wrote:
> > 
> > Hi Arnaud,
> >   
> >> From: Arnaud Ferraris <arnaud.ferraris@gmail.com>  
> > 
> > as mentioned before, this looks useful, so can you re-send this with a
> > commit message and your Signed-off-by:?  
> 
> It looks like you picked up this patch regardless?

Yes, I asked him twice, without any reply. At the end I figured that
the danger of a copyright infringement is low given the nature of the
change, and I didn't feel this should block this useful feature. The
alternative would be to have sent it as a patch of mine, but I felt
that I should preserve his authorship, so took the patch anyway.
I got a reply from him on another patch, and it's not his first U-Boot
patch, so I think it's just an oversight (from the sender of the patch?)

Chen-Yu asked about the feature lately, so if you think that approach
is dodgy, we can revert it and take another version of the patch.

> > Also I was wondering if you could increase the COMP_SIZE? The 64MB look
> > rather arbitrary and maybe unnecessarily limiting. I think we could go
> > up till 0xfa00000, but maybe should stop at 0xf800000, to leave some
> > space for further extensions?  
> 
> And you changed KERNEL_COMP_SIZE to 0xb000000. How does that work when
> U-Boot itself is at 0x4a000000 (KERNEL_COMP_ADDR_R + 0x6000000)?

It's not anymore at this time, that's just the load address, and it
relocates itself to the end of DRAM very early. So basically the whole
memory except the very end is available.
Btw, the reason we confine everything to below 0x50000000 is just that
we need to concatenate the base (0x4....) with that offset, and cannot
use arithmetic, because that doesn't work in the Makefiles.

Cheers,
Andre

> >> ---
> >>  include/configs/sunxi-common.h | 15 +++++++++++++++
> >>  1 file changed, 15 insertions(+)
> >>
> >> diff --git a/include/configs/sunxi-common.h b/include/configs/sunxi-common.h
> >> index 5b0bec0561..227284cd29 100644
> >> --- a/include/configs/sunxi-common.h
> >> +++ b/include/configs/sunxi-common.h
> >> @@ -291,6 +291,8 @@ extern int soft_i2c_gpio_scl;
> >>   */
> >>  #define BOOTM_SIZE	__stringify(0xa000000)
> >>  #define KERNEL_ADDR_R	__stringify(SDRAM_OFFSET(0080000))
> >> +#define KERNEL_COMP_ADDR_R	__stringify(SDRAM_OFFSET(4000000))
> >> +#define KERNEL_COMP_SIZE	__stringify(0x4000000)
> >>  #define FDT_ADDR_R	__stringify(SDRAM_OFFSET(FA00000))
> >>  #define SCRIPT_ADDR_R	__stringify(SDRAM_OFFSET(FC00000))
> >>  #define PXEFILE_ADDR_R	__stringify(SDRAM_OFFSET(FD00000))
> >> @@ -332,6 +334,18 @@ extern int soft_i2c_gpio_scl;
> >>  	"pxefile_addr_r=" PXEFILE_ADDR_R "\0" \
> >>  	"ramdisk_addr_r=" RAMDISK_ADDR_R "\0"
> >>  
> >> +#ifdef CONFIG_ARM64
> >> +
> >> +#define MEM_LAYOUT_ENV_EXTRA_SETTINGS \
> >> +	"kernel_comp_addr_r=" KERNEL_COMP_ADDR_R "\0" \
> >> +	"kernel_comp_size=" KERNEL_COMP_SIZE "\0"
> >> +
> >> +#else
> >> +
> >> +#define MEM_LAYOUT_ENV_EXTRA_SETTINGS ""  
> 
> This can be defined to nothing. No empty string is needed.
> 
> >> +
> >> +#endif
> >> +
> >>  #define DFU_ALT_INFO_RAM \
> >>  	"dfu_alt_info_ram=" \
> >>  	"kernel ram " KERNEL_ADDR_R " 0x1000000;" \
> >> @@ -487,6 +501,7 @@ extern int soft_i2c_gpio_scl;
> >>  #define CONFIG_EXTRA_ENV_SETTINGS \
> >>  	CONSOLE_ENV_SETTINGS \
> >>  	MEM_LAYOUT_ENV_SETTINGS \
> >> +	MEM_LAYOUT_ENV_EXTRA_SETTINGS \
> >>  	DFU_ALT_INFO_RAM \
> >>  	"fdtfile=" FDTFILE "\0" \
> >>  	"console=ttyS0,115200\0" \
> >>  
> >   
>