diff --git a/ld/devices.data b/ld/devices.data
index c9d50cf1..69756e98 100644
--- a/ld/devices.data
+++ b/ld/devices.data
@@ -186,7 +186,8 @@ stm32f7[67][89]?i* stm32f7ccm ROM=2048K RAM=384K CCM=128K
 stm32f750* stm32f7ccm ROM=64K RAM=256K CCM=64K
 stm32f730* stm32f7ccm ROM=64K RAM=192K CCM=64K
 
-stm32u5[78]5* stm32u5 ROM=2048K RAM=768K FPU=fpv5-sp-d16
+# on u5 the RAM1 and RAM2 can be combined to create one bigger bank
+stm32u5[78]5* stm32u5 ROM=2048K RAM=768K RAM3=512K RAM4=4K
 
 stm32l01??3* stm32l0 ROM=8K RAM=2K
 stm32l0[12]??4* stm32l0 ROM=16K RAM=2K