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You need to have a output buffer for that you can increase the size of theDSBL_SCRATCH_MEM_SIZE it can be OCMC or DDR based on the sbl image you are using)eg: <pdk_path>/ti/boot/sbl/sbl_component.mk.
Here i am using CUST SBL and DDR as a scratch memory increased from 0x4000000 to 0x5000000 ;
Make the changes in <pdk_path>ti/boot/sbl/soc/k3/sbl_soc.c to define where the input buffer is present.
Pass the load address while signing the image :
x509CertificateGen.sh -b xyz.appimage -o xyz.appimage.signed -c R5 -l 0x0 -k key.pem -d DEBUG -j DBG_FULL_ENABLE -m SPLIT_MODE -l 0xB8000000 here we are dividing our DDR scratch memory in to two parts first one is as output buffer and the rest is input buffer.