Use a small binary to set up HiFive Unleashed. (#221)

This binary comes from
https://github.com/timsifive/freedom-u540-c000-bootloader/tree/board_setup2,
which will hopefully be accepted upstream.

3 files changed, 10 insertions, 10 deletions

diff --git a/debug/targets/SiFive/HiFiveUnleashed-flash.lds b/debug/targets/SiFive/HiFiveUnleashed-flash.lds
index b8bf92a..fa30c6a 100644
--- a/debug/targets/SiFive/HiFiveUnleashed-flash.lds
+++ b/debug/targets/SiFive/HiFiveUnleashed-flash.lds
@@ -3,7 +3,7 @@ OUTPUT_ARCH( "riscv" )
 SECTIONS
 {
   . = 0x20000000;
-  .text : 
+  .text :
   {
     *(.text.entry)
     *(.text)
diff --git a/debug/targets/SiFive/HiFiveUnleashed.cfg b/debug/targets/SiFive/HiFiveUnleashed.cfg
index d883914..3aa5538 100644
--- a/debug/targets/SiFive/HiFiveUnleashed.cfg
+++ b/debug/targets/SiFive/HiFiveUnleashed.cfg
@@ -35,11 +35,6 @@ gdb_report_register_access_error enable
 # behavior.
 riscv expose_csrs 2288
 
-#>>>
-reset_config trst_and_srst
-adapter_nsrst_assert_width 100
-#<<<
-
 flash bank onboard_spi_flash fespi 0x20000000 0 0 0 $_TARGETNAME_0 0x10040000
 init
 
@@ -53,12 +48,17 @@ foreach t $targets {
     $t configure -event gdb-flash-write-end ""
 }
 
-reset
+reset halt
 
-halt
+# Use a modified bootloader to configure the hardware, especially the DDR controller.
+load_image targets/SiFive/HiFiveUnleashed_setup.bin 0x08000000
+foreach t [target names] {
+    targets $t
+    reg pc 0x08000000
+}
+resume
+wait_halt
 
 # Uncomment this if you want to be able to clobber your SPI Flash, which
 # probably you don't since you can do it through Linux
 #flash protect 0 0 last off
-
-echo "Ready for Remote Connections"
diff --git a/debug/targets/SiFive/HiFiveUnleashed_setup.bin b/debug/targets/SiFive/HiFiveUnleashed_setup.bin
new file mode 100755
index 0000000..893e574
--- /dev/null
+++ b/debug/targets/SiFive/HiFiveUnleashed_setup.bin