Hi Stefan

On Thu, 2022-01-13 at 19:42 +0100, Stefan Wahren wrote:

Hi Marcel,

Am 07.01.22 um 19:03 schrieb Marcel Ziswiler:

quoted

From: Marcel Ziswiler <redacted>

This avoids firmware load error and sysfs fallback reported as follows:

[    0.199448] imx-sdma 302c0000.dma-controller: Direct firmware load
 for imx/sdma/sdma-imx7d.bin failed with error -2
[    0.199487] imx-sdma 302c0000.dma-controller: Falling back to sysfs
 fallback for: imx/sdma/sdma-imx7d.bin

unfortunately this isn't an explanation why this solve the issue. It
looks like that the SDMA firmware is not available for the kernel. Build
the driver as a module hide the issue and just load it if the rootfs is
available.

Well, it seems to default to some built-in firmware which, unfortunately, might have some severe known errata
anyway.

What makes you sure that the driver is not critical for other boards
during boot?

That is a good question. I remember that there was some more discussion back when I proposed the same change
for imx_v6_v7_defconfig in the 32-bit Arm world. While nobody was able to fully answer it all it did get
accepted by the i.MX maintainer back in the day [1]. I will mention that in v2.

[1] https://lore.kernel.org/lkml/20210920144938.314588-6-marcel@ziswiler.com/ (local)

Thanks for your review.

Best regards

quoted

Signed-off-by: Marcel Ziswiler <redacted>
---

 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 3c8106c5776a..a18785a827dc 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig

@@ -915,7 +915,7 @@ CONFIG_DMADEVICES=y

 CONFIG_DMA_BCM2835=y
 CONFIG_DMA_SUN6I=m
 CONFIG_FSL_EDMA=y
-CONFIG_IMX_SDMA=y
+CONFIG_IMX_SDMA=m
 CONFIG_K3_DMA=y
 CONFIG_MV_XOR=y
 CONFIG_MV_XOR_V2=y

Cheers

Marcel
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