[RFC PATCH 0/0] Move the address of FW_JUMP_FDT_ADDR forward

[Xiang W]

在 2022-08-11星期四的 16:58 +0800，Nylon Chen写道：
> From: "Nylon.Chen" <nylon.chen at sifive.com>
> 
> A while ago.
> when we boot from QEMU by OpenSBI Jump mode with initramfs kerenl.
> 
> The kernel encountered panic because the kernel's section was
> overwritten, and the address was FW_JUMP_FDT_ADDR.
> 
> we find out the the rule `$(FW_TEXT_START) + 0x2200000` in
> platform/generic/config.mk
> 
> The situation is our kernel size big than it.
> 
> e.g. 
> # readelf -h vmlinux 
> init.bss's LMA is "0x00000000024a96a0", and when we use this rule, it
> exceeds its size.
> 
> 0x24a96a0 > 0x2200000
> 
> After our experiment, we can add offset FW_JUMP_FDT_ADDR, and the
> problem is solved.
> 
> But in my opinion, this is not a good method because the next time the
> kernel size increases, the same situation occurs again.
> 
> So maybe we can move the address forward and normalize the address to
> FW_JUMP_FDT_ADDR?
> 
> Signed-off-by: Nylon Chen <nylon.chen at sifive.com>
> -- 
> 2.36.1
> 
> 
Overwriting may occur regardless of the bit value adjustment.
You can build with:

make ... FW_JUMP_FDT_ADDR=xxx ...

Regards,
Xiang W