[PATCH] arch: arm: dts: agilex5: Disable cache allocation for reads

[Chee, Tien Fong]

> -----Original Message-----
> From: Ravulapalli, Naresh Kumar <naresh.kumar.ravulapalli at altera.com>
> Sent: Friday, August 8, 2025 5:40 PM
> To: u-boot at lists.denx.de
> Cc: Marek Vasut <marex at denx.de>; Simon Goldschmidt
> <simon.k.r.goldschmidt at gmail.com>; Chee, Tien Fong
> <tien.fong.chee at altera.com>; Tom Rini <trini at konsulko.com>; Yuslaimi, Alif
> Zakuan <alif.zakuan.yuslaimi at altera.com>; Ravulapalli, Naresh Kumar
> <naresh.kumar.ravulapalli at altera.com>
> Subject: [PATCH] arch: arm: dts: agilex5: Disable cache allocation for reads
> 
> In order to circumvent CCU NOC issue in Agilex5, it is recommended to
> disable cache allocation for reads. This prevents hang issues caused by CCP
> (Common Cache Pipe) Fill Done FIFO overflow.
> 
> Signed-off-by: Naresh Kumar Ravulapalli
> <nareshkumar.ravulapalli at altera.com>
> ---
>  arch/arm/dts/socfpga_agilex5-u-boot.dtsi | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/dts/socfpga_agilex5-u-boot.dtsi
> b/arch/arm/dts/socfpga_agilex5-u-boot.dtsi
> index 402f0bec173..d51a9e2ff7f 100644
> --- a/arch/arm/dts/socfpga_agilex5-u-boot.dtsi
> +++ b/arch/arm/dts/socfpga_agilex5-u-boot.dtsi
> @@ -209,7 +209,7 @@
>  					/* DMIUSMCTCR */
>  					<0x00000300 0x00000001
> 0x00000003>,
>  					<0x00000300 0x00000003
> 0x00000003>,
> -					<0x00000308 0x00000004
> 0x0000001F>;
> +					<0x00000308 0x0000000C
> 0x0000001F>;
>  				bootph-all;
>  			};
> 
> @@ -220,7 +220,7 @@
>  					/* DMIUSMCTCR */
>  					<0x00000300 0x00000001
> 0x00000003>,
>  					<0x00000300 0x00000003
> 0x00000003>,
> -					<0x00000308 0x00000004
> 0x0000001F>;
> +					<0x00000308 0x0000000C
> 0x0000001F>;
>  				bootph-all;
>  			};
>  		};
> --
> 2.35.3

Reviewed-by: Tien Fong Chee <tien.fong.chee at altera.com>

Best regards,
Tien Fong