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controller/Bootloader/flash.c
Jacob Alexander 2c7542e2e7 Fixing device bricking bug
- When loading a garbage image onto the device, the chip hangs
  and refuses to jump to the bootloader and start dfu

Fix
- Check if chip was in locked state and jump to dfu
- Check if watchdog timer fired and jump to dfu
2015-01-10 19:53:46 -08:00

93 lines
2.8 KiB
C

/* Copyright (c) 2011,2012 Simon Schubert <2@0x2c.org>.
* Modifications by Jacob Alexander 2014 <haata@kiibohd.com>
*
* This program 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 3 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
// ----- Local Includes -----
#include "mchck.h"
// ----- Variables -----
uint32_t flash_ALLOW_BRICKABLE_ADDRESSES;
// ----- Functions -----
/* This will have to live in SRAM. */
__attribute__((section(".ramtext.ftfl_submit_cmd"), long_call))
int ftfl_submit_cmd(void)
{
FTFL.fstat.raw = ((struct FTFL_FSTAT_t){
.ccif = 1,
.rdcolerr = 1,
.accerr = 1,
.fpviol = 1
}).raw;
struct FTFL_FSTAT_t stat;
while (!(stat = FTFL.fstat).ccif)
/* NOTHING */; /* XXX maybe WFI? */
return (!!stat.mgstat0);
}
int flash_prepare_flashing(void)
{
/* switch to FlexRAM */
if (!FTFL.fcnfg.ramrdy) {
FTFL.fccob.set_flexram.fcmd = FTFL_FCMD_SET_FLEXRAM;
FTFL.fccob.set_flexram.flexram_function = FTFL_FLEXRAM_RAM;
return (ftfl_submit_cmd());
}
return (0);
}
int flash_erase_sector(uintptr_t addr)
{
if (addr < (uintptr_t)&_app_rom &&
flash_ALLOW_BRICKABLE_ADDRESSES != 0x00023420)
return (-1);
FTFL.fccob.erase.fcmd = FTFL_FCMD_ERASE_SECTOR;
FTFL.fccob.erase.addr = addr;
return (ftfl_submit_cmd());
}
int flash_program_section(uintptr_t addr, size_t num_words)
{
FTFL.fccob.program_section.fcmd = FTFL_FCMD_PROGRAM_SECTION;
FTFL.fccob.program_section.addr = addr;
FTFL.fccob.program_section.num_words = num_words;
return (ftfl_submit_cmd());
}
int flash_program_sector(uintptr_t addr, size_t len)
{
return (len != FLASH_SECTOR_SIZE ||
(addr & (FLASH_SECTOR_SIZE - 1)) != 0 ||
flash_erase_sector(addr) ||
flash_program_section(addr, FLASH_SECTOR_SIZE/4));
}
void *flash_get_staging_area(uintptr_t addr, size_t len)
{
if ((addr & (FLASH_SECTOR_SIZE - 1)) != 0 ||
len != FLASH_SECTOR_SIZE)
return (NULL);
return (FlexRAM);
}