[PATCH] arch: mach-k3: fix mapping higher DDR addresses as device memory

[Nishanth Menon]

On 12:15-20240222, Neha Malcom Francis wrote:
> From: Sekhar Nori <nsekhar at ti.com>
> 
> An entry in memory map table for MMU configuration is spilling over and
> inadvertently mapping DDR available at higher address (above 4GB address
> space) as device memory (nGnRnE).
> 
> Fix this by adjusting entry size. Tested on AM62A SK by enabling
> CONFIG_CMD_TIME. Before this patch:
> 
> => time crc32 0x881000000 0x20000000
> crc32 for 881000000 ... 8a0ffffff ==> 5a7a5760
> 
> time: 1 minutes, 14.715 seconds
> 
> After patch:
> 
> => time crc32 0x881000000 0x20000000
> crc32 for 881000000 ... 8a0ffffff ==> 3df1ce02
> 
> time: 2.711 seconds
> 
> Signed-off-by: Sekhar Nori <nsekhar at ti.com>
> [n-francis at ti.com: rebased on next, retested on all devices inc. commit]
> Signed-off-by: Neha Malcom Francis <n-francis at ti.com>
> Cc: Andrew Davis <afd at ti.com>
> ---
> Boot logs:
> https://gist.github.com/nehamalcom/7b101ea8b97f5a9433a553ef881166a1
> 
>  arch/arm/mach-k3/arm64-mmu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm/mach-k3/arm64-mmu.c b/arch/arm/mach-k3/arm64-mmu.c
> index b4308205b2..0e07b1b7ce 100644
> --- a/arch/arm/mach-k3/arm64-mmu.c
> +++ b/arch/arm/mach-k3/arm64-mmu.c
> @@ -41,7 +41,7 @@ struct mm_region k3_mem_map[] = {
>  	}, {
>  		.virt = 0x500000000UL,
>  		.phys = 0x500000000UL,
> -		.size = 0x400000000UL,
> +		.size = 0x380000000UL,
>  		.attrs = PTE_BLOCK_MEMTYPE(MT_DEVICE_NGNRNE) |
>  			 PTE_BLOCK_NON_SHARE |
>  			 PTE_BLOCK_PXN | PTE_BLOCK_UXN
> -- 
> 2.34.1
> 
https://lore.kernel.org/u-boot/20240119160900.GU12635@bill-the-cat/ ??

Something was missing?

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D