[PATCH] riscv: Add a 64-bit image type

[Leo Liang]

Hi Bin,

On Thu, Apr 13, 2023 at 06:06:29PM +0800, Bin Meng wrote:
> On Mon, Apr 10, 2023 at 3:25 PM Rick Chen <rickchen36 at gmail.com> wrote:
> >
> > > From: Simon Glass <sjg at chromium.org>
> > > Sent: Monday, April 03, 2023 4:28 AM
> > > To: U-Boot Mailing List <u-boot at lists.denx.de>
> > > Cc: Sean Anderson <seanga2 at gmail.com>; Bin Meng <bmeng.cn at gmail.com>; Rick Jian-Zhi Chen(陳建志) <rick at andestech.com>; Leo Yu-Chi Liang(梁育齊) <ycliang at andestech.com>; Simon Glass <sjg at chromium.org>; Andre Przywara <andre.przywara at arm.com>; Marc Kleine-Budde <mkl at pengutronix.de>; SESA644425 <giojahermann at gmail.com>; Samuel Holland <samuel at sholland.org>; Steven Lawrance <steven.lawrance at softathome.com>
> > > Subject: [PATCH] riscv: Add a 64-bit image type
> > >
> > > At present it is not possible to know whether an image can be booted by a 32- or 64-bit bootloader. This means that U-Boot may attempt to boot the wrong image. This may cause a crash which might be hard to debug.
> > >
> > > Add a new property to make this explicit.
> > >
> > > The existing 'RISC-V' is now taken to mean 32-bit.
> > >
> > > Signed-off-by: Simon Glass <sjg at chromium.org>
> > > ---
> > >
> > >  boot/image.c    | 3 ++-
> > >  include/image.h | 3 ++-
> > >  2 files changed, 4 insertions(+), 2 deletions(-)
> >
> > Reviewed-by: Rick Chen <rick at andestech.com>
> 
> This might create compatibility issues if the shipped host tool
> (mkimage) does not match U-Boot version. Any idea how to avoid that?
> 

I am not sure if I understand you correctly.
Do you mean that there could be compatibility issue
if one uses 2023.04 release host tool (mkimage) to build images
that are to be booted by 2023.07 release u-boot (if this patch is merged in 2023.07 u-boot)?

If that is the case, I guess there is no easy way to avoid that.
We could probably have RISCV represent 64 bit riscv architecture
and RISCV32 32 bit because most of the boards are 64 bit.

If that is not the case, could you elaborate more ?

And Rick has sent out a patch to fix booting issue based on Simon's patch as well.

Best regards,
Leo

> Regards,
> Bin