diff --git a/tool/run/power_on/qemu b/tool/run/power_on/qemu
index e35a200f3c..c41879099a 100644
--- a/tool/run/power_on/qemu
+++ b/tool/run/power_on/qemu
@@ -107,7 +107,12 @@ proc run_power_on { } {
 	# on x86, we support booting via pxe or iso/disk image
 	if {[have_spec x86]} {
 		if {![regexp -- {-m} $qemu_args dummy]} {
-			append qemu_args " -m 512 "
+			if {[have_spec okl4]} {
+				# okl4 system integration specifies RAM from 32 to 800 MiB
+				append qemu_args " -m 800 "
+			} else {
+				append qemu_args " -m 512 "
+			}
 		}
 		if {[have_include "load/tftp"]} {
 			append qemu_args " -boot n -tftp [run_dir] -bootp boot/pulsar -no-reboot -no-shutdown "