From ef07427e06b1fa868ac7b96b18e77270f2231aed Mon Sep 17 00:00:00 2001
From: Sean Cross <sean@xobs.io>
Date: Mon, 14 Oct 2019 11:30:05 +0800
Subject: [PATCH] bsp: fomu: update

Signed-off-by: Sean Cross <sean@xobs.io>
---
 hw/bsp/fomu/bsp.c           |   8 ++-
 hw/bsp/fomu/crt0-vexriscv.S |  14 ++--
 hw/bsp/fomu/fomu.ld         | 130 ++++++++++++++++++++++++------------
 3 files changed, 98 insertions(+), 54 deletions(-)

diff --git a/hw/bsp/fomu/bsp.c b/hw/bsp/fomu/bsp.c
index 861c223f..2bba0ce2 100644
--- a/hw/bsp/fomu/bsp.c
+++ b/hw/bsp/fomu/bsp.c
@@ -116,9 +116,11 @@ int board_uart_read(uint8_t* buf, int len)
 
 int board_uart_write(void const * buf, int len)
 {
-  (void) buf;
-  (void) len;
-  return 0;
+  int32_t offset = 0;
+  for (offset = 0; offset < len; offset++)
+    if (! (messible_status_read() & CSR_MESSIBLE_STATUS_FULL_OFFSET))
+      messible_in_write(((uint8_t *)buf)[offset]);
+  return len;
 }
 
 #if CFG_TUSB_OS == OPT_OS_NONE
diff --git a/hw/bsp/fomu/crt0-vexriscv.S b/hw/bsp/fomu/crt0-vexriscv.S
index 931d50a0..46dca557 100644
--- a/hw/bsp/fomu/crt0-vexriscv.S
+++ b/hw/bsp/fomu/crt0-vexriscv.S
@@ -57,13 +57,13 @@ trap_entry:
 
 
 crt_init:
-  la sp, _fstack + 4
+  la sp, _estack - 4
   la a0, trap_entry
   csrw mtvec, a0
 
 bss_init:
-  la a0, _fbss
-  la a1, _ebss
+  la a0, _sbss
+  la a1, _ebss + 4
 bss_loop:
   beq a0,a1,bss_done
   sw zero,0(a0)
@@ -72,13 +72,13 @@ bss_loop:
 bss_done:
 
   /* Load DATA */
-  la t0, _erodata
-  la t1, _fdata
-  la t2, _edata
+  la t0, _etext
+  la t1, _srelocate
+  la t2, _erelocate + 4
 3:
   lw t3, 0(t0)
   sw t3, 0(t1)
-  /* _edata is aligned to 16 bytes. Use word-xfers. */
+  /* _edata is aligned to 4 bytes. Use word-xfers. */
   addi t0, t0, 4
   addi t1, t1, 4
   bltu t1, t2, 3b
diff --git a/hw/bsp/fomu/fomu.ld b/hw/bsp/fomu/fomu.ld
index 2a3f2376..abc91b8e 100644
--- a/hw/bsp/fomu/fomu.ld
+++ b/hw/bsp/fomu/fomu.ld
@@ -6,57 +6,99 @@ __DYNAMIC = 0;
 MEMORY {
 	csr : ORIGIN = 0x60000000, LENGTH = 0x01000000
 	vexriscv_debug : ORIGIN = 0xf00f0000, LENGTH = 0x00000100
-	sram : ORIGIN = 0x10000000, LENGTH = 0x00020000
+	ram : ORIGIN = 0x10000000, LENGTH = 0x00020000
 	rom : ORIGIN = 0x2001a000, LENGTH = 0x00200000 - 0x1a000
 }
 
+/* The stack size used by the application. NOTE: you need to adjust according to your application. */
+STACK_SIZE = DEFINED(STACK_SIZE) ? STACK_SIZE : DEFINED(__stack_size__) ? __stack_size__ : 0x2000;
+
+/* Section Definitions */
 SECTIONS
 {
-	.text :
-	{
-		_ftext = .;
+    .text :
+    {
+        . = ALIGN(4);
+        _ftext = .;
 		*(.text.start)
-		*(.text .stub .text.* .gnu.linkonce.t.*)
-		_etext = .;
-	} > rom
+        *(.text .text.* .gnu.linkonce.t.*)
+        *(.glue_7t) *(.glue_7)
+        *(.rodata .rodata* .gnu.linkonce.r.*)
 
-	.rodata :
-	{
-		. = ALIGN(4);
-		_frodata = .;
-		*(.rodata .rodata.* .gnu.linkonce.r.*)
-		*(.rodata1)
-		*(.srodata)
-		. = ALIGN(4);
-		_erodata = .;
-	} > rom
+        /* Support C constructors, and C destructors in both user code
+           and the C library. This also provides support for C++ code. */
+        . = ALIGN(4);
+        KEEP(*(.init))
+        . = ALIGN(4);
+        __preinit_array_start = .;
+        KEEP (*(.preinit_array))
+        __preinit_array_end = .;
 
-	.data : AT (ADDR(.rodata) + SIZEOF (.rodata))
-	{
-		. = ALIGN(4);
-		_fdata = .;
-		*(.data .data.* .gnu.linkonce.d.*)
-		*(.data1)
-		_gp = ALIGN(16);
-		*(.sdata .sdata.* .gnu.linkonce.s.* .sdata2 .sdata2.*)
-		. = ALIGN(16);
-		_edata = .; /* Make sure _edata is >= _gp. */
-	} > sram
+        . = ALIGN(4);
+        __init_array_start = .;
+        KEEP (*(SORT(.init_array.*)))
+        KEEP (*(.init_array))
+        __init_array_end = .;
 
-	.bss :
-	{
-		_fbss = .;
-		*(.dynsbss)
-		*(.sbss .sbss.* .gnu.linkonce.sb.*)
-		*(.scommon)
-		*(.dynbss)
-		*(.bss .bss.* .gnu.linkonce.b.*)
-		*(COMMON)
-		. = ALIGN(4);
-		_ebss = .;
-		_end = .;
-        PROVIDE(end = .);
-	} > sram
-}
+        . = ALIGN(4);
+        KEEP (*crtbegin.o(.ctors))
+        KEEP (*(EXCLUDE_FILE (*crtend.o) .ctors))
+        KEEP (*(SORT(.ctors.*)))
+        KEEP (*crtend.o(.ctors))
 
-PROVIDE(_fstack = ORIGIN(sram) + LENGTH(sram) - 4);
+        . = ALIGN(4);
+        KEEP(*(.fini))
+
+        . = ALIGN(4);
+        __fini_array_start = .;
+        KEEP (*(.fini_array))
+        KEEP (*(SORT(.fini_array.*)))
+        __fini_array_end = .;
+
+        KEEP (*crtbegin.o(.dtors))
+        KEEP (*(EXCLUDE_FILE (*crtend.o) .dtors))
+        KEEP (*(SORT(.dtors.*)))
+        KEEP (*crtend.o(.dtors))
+    } > rom
+
+    . = ALIGN(4);
+    _etext = .;            /* End of text section */
+
+    .relocate : AT (_etext)
+    {
+        . = ALIGN(4);
+        _srelocate = .;
+        *(.ramfunc .ramfunc.*);
+        *(.data .data.*);
+        . = ALIGN(4);
+        _erelocate = .;
+    } > ram
+
+    /* .bss section which is used for uninitialized data */
+    .bss (NOLOAD) :
+    {
+        . = ALIGN(4);
+        _sbss = . ;
+        _szero = .;
+        *(.bss .bss.*)
+        *(.sbss .sbss.*)
+        *(COMMON)
+        . = ALIGN(4);
+        _ebss = . ;
+        _ezero = .;
+        end = .;
+    } > ram
+
+    /* stack section */
+    .stack (NOLOAD):
+    {
+        . = ALIGN(8);
+        _sstack = .;
+        . = . + STACK_SIZE;
+        . = ALIGN(8);
+        _estack = .;
+    } > ram
+
+    . = ALIGN(4);
+    _end = . ;
+}
\ No newline at end of file