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/*
* Copyright (c) 2013, Sergey 'Jin' Bostandzhyan
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* This is a hack for Rockchip rk30xx based devices. The problem is that
* the MEMERASE ioctl is failing (hangs and never returns) in their kernel.
* The sources are not fully available, so fixing it in the rk30xxnand_ko driver
* is not possible.
*
* I straced the stock recovery application and it seems to avoid this
* particular ioctl, instead it is simply writing zeroes using the write() call.
*
* This workaround does the same and will replace all MEMERASE occurances in
* the recovery code.
*/
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include "rk30hack.h"
int rk30_zero_out(int fd, off_t pos, ssize_t size)
{
if (lseek(fd, pos, SEEK_SET) != pos) {
fprintf(stderr, "mtd: erase failure at 0x%08lx (%s)\n",
pos, strerror(errno));
return -1;
}
unsigned char *zb = (unsigned char *)calloc(1, size);
if (zb == NULL) {
fprintf(stderr, "mtd: erase failure, could not allocate memory\n");
return -1;
}
if (write(fd, zb, size) != size) {
fprintf(stderr, "mtd: erase failure at 0x%08lx (%s)\n",
pos, strerror(errno));
free(zb);
return -1;
}
free(zb);
return 0;
}
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