Memory issues introduced when updating Linux kernel version

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I have a Linux kernel v4.19 built using Yocto Pyro that works well. I have updated to kernel v5.4 and Yocto Dunfell. With this update I am now having issues running out of memory while uncompressing my ramdisk image during boot.

My ramdisk image is minimal, only containing Busybox + SWUpdate + a few other minor utils, for use in a recovery scenario.

My system has 128 MB of memory.

My uncompressed ramdisk image is 41 MB.

I have these CONFIGs set as below:

CONFIG_BLK_DEV_RAM=y
CONFIG_BLK_DEV_RAM_COUNT=4
CONFIG_BLK_DEV_RAM_SIZE=65536

I have plenty of memory for the ramdisk image and I think I have the relevant ramdisk configs set correctly.

I am thinking there is some CONFIGs that have changed in my upgrade from kernel v4.19 -> v5.4 that I need to set?

I did not have these memory issues with kernel v4.19.

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