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//==========================================================================
//
// flash_load.c
//
// RedBoot file/image loader into flash
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 2006 Free Software Foundation, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later
// version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License
// along with eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): Oliver Munz
// Contributors: om, asl
// Date: 2006-02-21
// Purpose:
// Description:
//
// This code is part of RedBoot (tm).
//
//####DESCRIPTIONEND####
//
//==========================================================================
#include <redboot.h>
#include <flash_load.h>
#include <cyg/io/flash.h>
#include <cyg/infra/cyg_ass.h>
static int flash_block_size;
static cyg_uint8 * current_flash_page;
/* Allocation of the flash-sector size RAM-buffer is done */
static bool init_done = false;
/* We have initialized the current page ready for writing */
static bool flash_page_init = false;
static cyg_uint8 *flash_buffer;
// If the io flash code outputs when erasing/writing it will upset the
// download over the communications channel. So we install a dummy
// print function.
static int dummy_printf(const char *fmt, ...){
return 0;
}
// Calculate the address of the first byte in a flash block
static cyg_uint8 * flash_block_begin(cyg_uint32 addr)
{
return (cyg_uint8 *)
((addr / flash_block_size) * flash_block_size);
}
// Initialize the loading process
void flash_load_start(void)
{
flash_init(dummy_printf);
init_done = true;
flash_page_init = false;
}
// Write a byte into flash. We maintain a copy in RAM of the FLASH
// page we are currently "writing" into. This copy is loaded with the
// current contents of the FLASH page when the first byte is "written"
// to the page. The "writes" are then made into the RAM copy. We only
// write to FLASH when there is a "write" outside of the current page,
// or the flash_load_finish function is called.
void flash_load_write(cyg_uint8 *flash_addr, cyg_uint8 value)
{
cyg_uint32 retcode = FLASH_ERR_OK;
void * err_addr;
cyg_uint32 addr = (cyg_uint32)flash_addr;
cyg_uint32 offset;
if (!flash_page_init) {
/* First Byte for the current flash block. Read the current contents */
current_flash_page = flash_block_begin(addr);
flash_read(flash_buffer, current_flash_page, flash_block_size, &err_addr);
flash_page_init = true;
}
if (flash_block_begin(addr) != current_flash_page) {
/* We have moved into the next flash page. Write the current
page so we can move on */
retcode = flash_erase(current_flash_page, flash_block_size, &err_addr);
if (retcode != FLASH_ERR_OK){ /* Flash ERROR */
diag_printf("Error erase at %p: %s\n", err_addr, flash_errmsg(retcode));
return;
}
retcode = flash_program(current_flash_page, flash_buffer,
flash_block_size, &err_addr);
if (retcode != FLASH_ERR_OK){
diag_printf("Error writing at %p: %s\n",
err_addr, flash_errmsg(retcode));
return;
}
current_flash_page = flash_block_begin(addr);
flash_read(flash_buffer, current_flash_page, flash_block_size, &err_addr);
}
offset = flash_addr - current_flash_page;
CYG_ASSERT(offset < flash_block_size, "offset not inside flash block");
flash_buffer[offset] = value;
}
// Program the current page into flash.
void flash_load_finish(void)
{
cyg_uint32 retcode = FLASH_ERR_OK;
void * err_addr;
if (init_done && flash_page_init) {
flash_page_init = false;
retcode = flash_erase(current_flash_page, flash_block_size, &err_addr);
if (retcode != FLASH_ERR_OK){
diag_printf("Error erase at %p: %s\n", err_addr, flash_errmsg(retcode));
} else {
retcode = flash_program(current_flash_page, flash_buffer,
flash_block_size, &err_addr);
if (retcode != FLASH_ERR_OK){
diag_printf("Error writing at %p: %s\n",
err_addr, flash_errmsg(retcode));
}
}
}
flash_init(diag_printf);
}
// This is called during redboot start up. We allocate a buffer the
// size of the flash page.
void
flash_load_init(void)
{
int flash_blocks;
flash_get_block_info(&flash_block_size, &flash_blocks);
workspace_end -= flash_block_size;
flash_buffer = workspace_end;
}
// Register this initialization function in the table
RedBoot_init(flash_load_init, RedBoot_INIT_LAST);
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