u-boot make failure: SPL image too big

When trying to build u-boot/make the preloader, I get the following message: arm-altera-eabi-ld: SPL image too big

make CROSS_COMPILE=arm-altera-eabi- -C uboot-socfpga spl/u-boot-spl.bin
...
cd /home/firmware/Documents/DE1_SoC_demo_ds5/software/spl_bsp/uboot-socfpga/spl/ && arm-altera-eabi-ld  -T /home/firmware/Documents/DE1_SoC_demo_ds5/software/spl_bsp/uboot-socfpga/spl/u-boot-spl.lds --gc-sections -Bstatic arch/arm/cpu/armv7/start.o --start-group arch/arm/cpu/armv7/libarmv7.o arch/arm/cpu/armv7/socfpga/libsocfpga.o arch/arm/lib/libarm.o board/altera/socfpga/libsocfpga.o board/altera/socfpga/sdram/libsocfpga-sdram.o --end-group /home/firmware/Documents/DE1_SoC_demo_ds5/software/spl_bsp/uboot-socfpga/spl/arch/arm/lib/eabi_compat.o -L /opt/intelFPGA/18.0/embedded/host_tools/mentor/gnu/arm/baremetal/bin/../lib/gcc/arm-altera-eabi/6.2.0 -lgcc -Map u-boot-spl.map -o u-boot-spl
arm-altera-eabi-ld: SPL image too big
arch/arm/cpu/armv7/socfpga/libsocfpga.o: In function `sdram_mmr_init_full':
/home/firmware/Documents/DE1_SoC_demo_ds5/software/spl_bsp/uboot-socfpga/arch/arm/cpu/armv7/socfpga/sdram.c:377: undefined reference to `__stack_start'
/home/firmware/Documents/DE1_SoC_demo_ds5/software/spl_bsp/uboot-socfpga/arch/arm/cpu/armv7/socfpga/sdram.c:377: undefined reference to `__sdram_stack_start'
arch/arm/cpu/armv7/socfpga/libsocfpga.o: In function `s_init':
/home/firmware/Documents/DE1_SoC_demo_ds5/software/spl_bsp/uboot-socfpga/arch/arm/cpu/armv7/socfpga/s_init.c:73: undefined reference to `memset'
/home/firmware/Documents/DE1_SoC_demo_ds5/software/spl_bsp/uboot-socfpga/arch/arm/cpu/armv7/socfpga/s_init.c:92: undefined reference to `__ecc_padding_start'
/home/firmware/Documents/DE1_SoC_demo_ds5/software/spl_bsp/uboot-socfpga/arch/arm/cpu/armv7/socfpga/s_init.c:92: undefined reference to `__ecc_padding_end'
arch/arm/cpu/armv7/socfpga/libsocfpga.o: In function `sdram_mmr_init_full':
/home/firmware/Documents/DE1_SoC_demo_ds5/software/spl_bsp/uboot-socfpga/arch/arm/cpu/armv7/socfpga/sdram.c:1264: undefined reference to `board_init_r'
/home/firmware/Documents/DE1_SoC_demo_ds5/software/spl_bsp/uboot-socfpga/arch/arm/cpu/armv7/socfpga/sdram.c:1265: undefined reference to `__stack_start'
/home/firmware/Documents/DE1_SoC_demo_ds5/software/spl_bsp/uboot-socfpga/arch/arm/cpu/armv7/socfpga/sdram.c:1277: undefined reference to `gdata'
make[2]: *** [Makefile:178: /home/firmware/Documents/DE1_SoC_demo_ds5/software/spl_bsp/uboot-socfpga/spl/u-boot-spl] Error 1
make[2]: Leaving directory '/home/firmware/Documents/DE1_SoC_demo_ds5/software/spl_bsp/uboot-socfpga/spl'
make[1]: *** [Makefile:611: spl/u-boot-spl.bin] Error 2
make[1]: Leaving directory '/home/firmware/Documents/DE1_SoC_demo_ds5/software/spl_bsp/uboot-socfpga'
make: *** [Makefile:187: uboot-socfpga/spl/u-boot-spl.bin] Error 2

Performing the build on a Ubuntu 20.04 virtual machine which has SoC EDS 18.0.0.614 installed. BSP and HDL was created on Windows 10 build 19041 using the same Quartus and SoC EDS version. Target board is the Terasic DE1-SoC dev kit.