linux-kernel - [PATCH] arm64: defconfig: Build STMMAC Ethernet driver into the kernel for NFS boot

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Message-ID: <20250506104731.111876-1-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date: Tue,  6 May 2025 11:47:31 +0100
From: Prabhakar <prabhakar.csengg@...il.com>
To: Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Bjorn Andersson <bjorn.andersson@....qualcomm.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	Prabhakar <prabhakar.csengg@...il.com>,
	Biju Das <biju.das.jz@...renesas.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH] arm64: defconfig: Build STMMAC Ethernet driver into the kernel for NFS boot

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Enable `CONFIG_STMMAC_ETH` as built-in (`y`) instead of a module (`m`) to
ensure the Ethernet driver is available early in the boot process. This
is necessary for platforms mounting the root filesystem via NFS, as the
driver must be available before the root filesystem is accessed.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
With this change, the Renesas RZ/V2H EVK board can boot from NFS
which has the DWMAC IP.
---
 arch/arm64/configs/defconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 2dd75c799848..38d1c2ff3aa9 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -379,7 +379,7 @@ CONFIG_SMC91X=y
 CONFIG_SMSC911X=y
 CONFIG_SNI_AVE=y
 CONFIG_SNI_NETSEC=y
-CONFIG_STMMAC_ETH=m
+CONFIG_STMMAC_ETH=y
 CONFIG_DWMAC_MEDIATEK=m
 CONFIG_DWMAC_TEGRA=m
 CONFIG_TI_K3_AM65_CPSW_NUSS=y
-- 
2.49.0