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https://github.com/brain-hackers/u-boot-brain
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60d7d5a631
Most of the various environment functions create CONFIG_ENV_SIZE buffers on the stack. At least on ARM and PPC which have 4KB stacks, this can overflow the stack if we have large environment sizes. So move all the buffers off the stack to static buffers. Signed-off-by: Rob Herring <rob.herring@calxeda.com>
116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
/*
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* LowLevel function for DataFlash environment support
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* Author : Gilles Gastaldi (Atmel)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <command.h>
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#include <environment.h>
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#include <linux/stddef.h>
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#include <dataflash.h>
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#include <search.h>
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#include <errno.h>
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DECLARE_GLOBAL_DATA_PTR;
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env_t *env_ptr;
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char *env_name_spec = "dataflash";
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static char env_buf[CONFIG_ENV_SIZE];
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uchar env_get_char_spec(int index)
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{
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uchar c;
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read_dataflash(CONFIG_ENV_ADDR + index + offsetof(env_t, data),
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1, (char *)&c);
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return c;
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}
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void env_relocate_spec(void)
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{
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read_dataflash(CONFIG_ENV_ADDR, CONFIG_ENV_SIZE, env_buf);
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env_import(env_buf, 1);
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}
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#ifdef CONFIG_ENV_OFFSET_REDUND
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#error No support for redundant environment on dataflash yet!
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#endif
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int saveenv(void)
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{
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env_t *env_new = (env_t *)env_buf;
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ssize_t len;
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char *res;
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res = (char *)env_new->data;
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len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL);
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if (len < 0) {
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error("Cannot export environment: errno = %d\n", errno);
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return 1;
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}
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env_new->crc = crc32(0, env_new->data, ENV_SIZE);
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return write_dataflash(CONFIG_ENV_ADDR,
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(unsigned long)env_new,
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CONFIG_ENV_SIZE);
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}
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/*
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* Initialize environment use
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*
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* We are still running from ROM, so data use is limited.
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* Use a (moderately small) buffer on the stack
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*/
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int env_init(void)
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{
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ulong crc, len = ENV_SIZE, new = 0;
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unsigned off;
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uchar buf[64];
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if (gd->env_valid)
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return 0;
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AT91F_DataflashInit(); /* prepare for DATAFLASH read/write */
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/* read old CRC */
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read_dataflash(CONFIG_ENV_ADDR + offsetof(env_t, crc),
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sizeof(ulong), (char *)&crc);
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off = offsetof(env_t, data);
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while (len > 0) {
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int n = (len > sizeof(buf)) ? sizeof(buf) : len;
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read_dataflash(CONFIG_ENV_ADDR + off, n, (char *)buf);
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new = crc32(new, buf, n);
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len -= n;
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off += n;
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}
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if (crc == new) {
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gd->env_addr = offsetof(env_t, data);
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gd->env_valid = 1;
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} else {
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gd->env_addr = (ulong)&default_environment[0];
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gd->env_valid = 0;
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}
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return 0;
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}
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