Re: [PATCH] arm: armv8: mmu: fix mem_map_from_dram_banks

[Emanuele Ghidoli <ghidoliemanuele@gmail.com>]

On 31/10/2025 17:17, Anshul Dalal wrote:
> mem_map_from_dram_banks calls fdtdec_setup_memory_banksize to setup the
> dram banks though that is expected to be done by dram_init_banksize as
> part of board_r sequence.
> 
> This has the side effect of modifying gd->bd->bi_dram as well, therefore
> this patch removes the call and updates spl_enable_cache for K3 to call
> dram_init_banksize.
> 
> Signed-off-by: Anshul Dalal <anshuld@ti.com>
> Reported-by: Francesco Dolcini <francesco@dolcini.it>
> Closes: https://lore.kernel.org/u-boot/20251027165225.GA71553@francesco-nb/
> Fixes: fe2647f2a0d4 ("arm: armv8: mmu: add mem_map_from_dram_banks")
> ---
>  arch/arm/cpu/armv8/cache_v8.c | 6 ------
>  arch/arm/mach-k3/common.c     | 1 +
>  2 files changed, 1 insertion(+), 6 deletions(-)
> 
> diff --git a/arch/arm/cpu/armv8/cache_v8.c b/arch/arm/cpu/armv8/cache_v8.c
> index 672ec16d4834be501d5bfa343af9537aa9285252..0309da6d3971af6f2a349ce0760507765da9af4f 100644
> --- a/arch/arm/cpu/armv8/cache_v8.c
> +++ b/arch/arm/cpu/armv8/cache_v8.c
> @@ -61,12 +61,6 @@ static int get_effective_el(void)
>  int mem_map_from_dram_banks(unsigned int index, unsigned int len, u64 attrs)
>  {
>  	unsigned int i;
> -	int ret = fdtdec_setup_memory_banksize();
> -
> -	if (ret) {
> -		log_err("%s: Failed to setup dram banks\n", __func__);
> -		return ret;
> -	}
>  
>  	if (index + CONFIG_NR_DRAM_BANKS >= len) {
>  		log_err("%s: Provided mem_map array has insufficient size for DRAM entries\n",
> diff --git a/arch/arm/mach-k3/common.c b/arch/arm/mach-k3/common.c
> index 7c06764af8256b7fd27f8e7f208a597b1b91652b..82a31b5178b9b5abdf7eae68cbbd22fe2a86dbee 100644
> --- a/arch/arm/mach-k3/common.c
> +++ b/arch/arm/mach-k3/common.c
> @@ -311,6 +311,7 @@ void spl_enable_cache(void)
>  	int ret = 0;
>  
>  	dram_init();
> +	dram_init_banksize();
>  
>  	/* reserve TLB table */
>  	gd->arch.tlb_size = PGTABLE_SIZE;
> 
> ---
> base-commit: 08bf42e1faa4411cd347c2e370da790a0116e318
> change-id: 20251031-k3_fix_mmu-bd62988ed62d
> 
> Best regards,

Hello Anshul,
this effectively fixes the regression.
Thanks!

Tested-by: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>