works, not ramless

bootloader.c

@@ -161,13 +161,12 @@ extern volatile uint32_t            USB_EP1_IN[32];
 #define USB_EP1_IN_OLDOLD(offs)    (*(volatile uint32_t *)(0x400060C0 + 2 * (offs)))
 
 #define USB_UF2_FIELDS_STASH(offs)  (*(uint32_t *)(0x400061d4 + 2 * (offs)))
-#define ACTIVE_CONFIG       USB_UF2_FIELDS_STASH(12)
+extern uint32_t ACTIVE_CONFIG;
-#define UF2_BLOCKS_LEFT     USB_UF2_FIELDS_STASH(14)
+extern uint32_t UF2_BLOCKS_LEFT;
-#define CTRL_XFER_STATE     USB_UF2_FIELDS_STASH(16)
+extern uint32_t CTRL_XFER_STATE;
-#define CTRL_XFER_STATE_X   USB_UF2_FIELDS_STASH(18)
+extern uint32_t CTRL_XFER_STATE_X;
-#define CTRL_XFER_DESC_SZ   USB_UF2_FIELDS_STASH(20)
+extern uint32_t CTRL_XFER_DESC_SZ;
-extern volatile uint32_t            USB_SECTOR_STASH[128];
+extern uint32_t USB_SECTOR_STASH[128];
-// #define USB_SECTOR_STASH(offs)      (*(uint32_t *)(0x40006200 + 2 * (offs)))
 
 #define USB_EPTYPE_BULK     0b00
 #define USB_EPTYPE_CONTROL  0b01

linker.lds

@@ -37,7 +37,12 @@ SECTIONS
     PROVIDE( USB_EP0_OUT        = 0x40006020 );
     PROVIDE( USB_EP0_IN         = 0x40006030 );
     PROVIDE( USB_EP1_OUT        = 0x40006040 );
-    PROVIDE( USB_EP1_IN         = 0x400060C0 );
+    PROVIDE( USB_EP1_IN         = 0x400060c0 );
+    PROVIDE( ACTIVE_CONFIG      = 0x400061ec );
+    PROVIDE( UF2_BLOCKS_LEFT    = 0x400061f0 );
+    PROVIDE( CTRL_XFER_STATE    = 0x400061f4 );
+    PROVIDE( CTRL_XFER_STATE_X  = 0x400061f8 );
+    PROVIDE( CTRL_XFER_DESC_SZ  = 0x400061fc );
     PROVIDE( USB_SECTOR_STASH   = 0x40006200 );
 
     PROVIDE(_data_lma = .);

startup.S

@@ -87,6 +87,8 @@ _enter_application_code:
 _enter_bootloader:
     sh zero, (a3)
 
+    // xxx testing
+    la sp, 0x20000100
     // Set up global pointer
 .option push
 .option norelax