80a90edd47
Due to a kernel bug and no available sources we have to work around the MEMERASE ioctl - if used, it hangs and never returns. I straced the original recovery executable and could see that it is simply calling write() with a bunch of zeroes instead of using MEMERASE. Added a hack that does the same and now the resulting TWRP recovery image works. Change-Id: I1b1c1c9e870e350776346bdca5d442c7ef565aa0
61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
/*
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* Copyright (c) 2013, Sergey 'Jin' Bostandzhyan
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* This is a hack for Rockchip rk30xx based devices. The problem is that
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* the MEMERASE ioctl is failing (hangs and never returns) in their kernel.
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* The sources are not fully available, so fixing it in the rk30xxnand_ko driver
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* is not possible.
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*
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* I straced the stock recovery application and it seems to avoid this
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* particular ioctl, instead it is simply writing zeroes using the write() call.
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*
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* This workaround does the same and will replace all MEMERASE occurances in
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* the recovery code.
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*/
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include "rk30hack.h"
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int rk30_zero_out(int fd, off_t pos, ssize_t size)
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{
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if (lseek(fd, pos, SEEK_SET) != pos) {
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fprintf(stderr, "mtd: erase failure at 0x%08lx (%s)\n",
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pos, strerror(errno));
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return -1;
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}
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unsigned char *zb = (unsigned char *)calloc(1, size);
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if (zb == NULL) {
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fprintf(stderr, "mtd: erase failure, could not allocate memory\n");
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return -1;
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}
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if (write(fd, zb, size) != size) {
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fprintf(stderr, "mtd: erase failure at 0x%08lx (%s)\n",
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pos, strerror(errno));
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free(zb);
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return -1;
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}
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free(zb);
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return 0;
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}
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