Unable to Fully Disable rk_crypto2 in Armbian Build for RK3588

Hi everyone,

I’m working on a custom Armbian build for an RK3588-based board (cm3588-nas) and trying to completely disable the Rockchip crypto driver (rk_crypto2), since it's negatively impacting LUKS (AES-XTS) performance. 

Despite several attempts, the module continues to register algorithms in /proc/crypto after boot:

  driver       : rk2-sm3
  module       : rk_crypto2
  driver       : rk2-sha512
  module       : rk_crypto2
  driver       : xts-aes-rk2
  module       : rk_crypto2
  ...

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What I’ve Tried
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1. Kernel Config Override
   - Added CONFIG_CRYPTO_DEV_ROCKCHIP=n and CONFIG_CRYPTO_DEV_ROCKCHIP2=n

 to:
     userpatches/linux-rockchip-rk3588-edge.config
   - Verified .config has it set to n after build.
   - Used CLEAN_LEVEL="make,debs,oldcache" in the build command.

2. Blacklisting & Deletion in customize-image.sh
   echo "blacklist rk_crypto" > /etc/modprobe.d/blacklist-rk_crypto.conf
   rm -f /lib/modules/*/kernel/drivers/crypto/rockchip/rk_crypto.ko*

3. Post-Boot Verification
   - lsmod | grep rk_crypto → empty
   - modinfo rk_crypto → module not found
   - /proc/crypto still shows rk2-* drivers tied to rk_crypto2

4. Manual Source Removal
   - Commented out this line in drivers/crypto/rockchip/Makefile:
     # obj-$(CONFIG_CRYPTO_DEV_ROCKCHIP) += rk_crypto.o
   - Also removed or disabled its Kconfig entry.

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System Details
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  Board   : cm3588-nas (RK3588)
  Kernel  : rockchip-rk3588 edge (Linux 6.8.x)
  Builder : Official Armbian compile.sh

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Goal
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I want to fully disable the Rockchip crypto engine (rk_crypto2):
- It should not load, not build, and not register anything in /proc/crypto.
- LUKS should fall back to software crypto (cryptd, aesni, or default fallback).

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Any help is appreciated. I’d love to hear from anyone who’s successfully disabled rk_crypto2 entirely or has ideas for where the registration is coming from even when the module appears removed.

Thanks!