Merge branches 'at91', 'ep93xx', 'errata', 'footbridge', 'fncpy', 'gemini',...

*.gz

*.bz2

*.lzma

*.xz

*.lzo

*.patch

*.gcno

     </sect1>

  </chapter>

  <chapter id="fs_events">

     <title>Events based on file descriptors</title>

!Efs/eventfd.c

  </chapter>

  <chapter id="sysfs">

     <title>The Filesystem for Exporting Kernel Objects</title>

!Efs/sysfs/file.c

BIN := vrl4

.PHONY: all

all: $(BIN)

.PHONY: clean

clean:

	rm -f *.o $(BIN)

/*

 * vrl4 format generator

 *

 * Copyright (C) 2010 Simon Horman

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file "COPYING" in the main directory of this archive

 * for more details.

 */

/*

 * usage: vrl4 < zImage > out

 *	  dd if=out of=/dev/sdx bs=512 seek=1 # Write the image to sector 1

 *

 * Reads a zImage from stdin and writes a vrl4 image to stdout.

 * In practice this means writing a padded vrl4 header to stdout followed

 * by the zImage.

 *

 * The padding places the zImage at ALIGN bytes into the output.

 * The vrl4 uses ALIGN + START_BASE as the start_address.

 * This is where the mask ROM will jump to after verifying the header.

 *

 * The header sets copy_size to min(sizeof(zImage), MAX_BOOT_PROG_LEN) + ALIGN.

 * That is, the mask ROM will load the padded header (ALIGN bytes)

 * And then MAX_BOOT_PROG_LEN bytes of the image, or the entire image,

 * whichever is smaller.

 *

 * The zImage is not modified in any way.

 */

#define _BSD_SOURCE

#include <endian.h>

#include <unistd.h>

#include <stdint.h>

#include <stdio.h>

#include <errno.h>

struct hdr {

	uint32_t magic1;

	uint32_t reserved1;

	uint32_t magic2;

	uint32_t reserved2;

	uint16_t copy_size;

	uint16_t boot_options;

	uint32_t reserved3;

	uint32_t start_address;

	uint32_t reserved4;

	uint32_t reserved5;

	char     reserved6[308];

};

#define DECLARE_HDR(h)					\

	struct hdr (h) = {				\

		.magic1 =	htole32(0xea000000),	\

		.reserved1 =	htole32(0x56),		\

		.magic2 =	htole32(0xe59ff008),	\

		.reserved3 =	htole16(0x1) }

/* Align to 512 bytes, the MMCIF sector size */

#define ALIGN_BITS	9

#define ALIGN		(1 << ALIGN_BITS)

#define START_BASE	0xe55b0000

/*

 * With an alignment of 512 the header uses the first sector.

 * There is a 128 sector (64kbyte) limit on the data loaded by the mask ROM.

 * So there are 127 sectors left for the boot programme. But in practice

 * Only a small portion of a zImage is needed, 16 sectors should be more

 * than enough.

 *

 * Note that this sets how much of the zImage is copied by the mask ROM.

 * The entire zImage is present after the header and is loaded

 * by the code in the boot program (which is the first portion of the zImage).

 */

#define	MAX_BOOT_PROG_LEN (16 * 512)

#define ROUND_UP(x)	((x + ALIGN - 1) & ~(ALIGN - 1))

ssize_t do_read(int fd, void *buf, size_t count)

{

	size_t offset = 0;

	ssize_t l;

	while (offset < count) {

		l = read(fd, buf + offset, count - offset);

		if (!l)

			break;

		if (l < 0) {

			if (errno == EAGAIN || errno == EWOULDBLOCK)

				continue;

			perror("read");

			return -1;

		}

		offset += l;

	}

	return offset;

}

ssize_t do_write(int fd, const void *buf, size_t count)

{

	size_t offset = 0;

	ssize_t l;

	while (offset < count) {

		l = write(fd, buf + offset, count - offset);

		if (l < 0) {

			if (errno == EAGAIN || errno == EWOULDBLOCK)

				continue;

			perror("write");

			return -1;

		}

		offset += l;

	}

	return offset;

}

ssize_t write_zero(int fd, size_t len)

{

	size_t i = len;

	while (i--) {

		const char x = 0;

		if (do_write(fd, &x, 1) < 0)

			return -1;

	}

	return len;

}

int main(void)

{

	DECLARE_HDR(hdr);

	char boot_program[MAX_BOOT_PROG_LEN];

	size_t aligned_hdr_len, alligned_prog_len;

	ssize_t prog_len;

	prog_len = do_read(0, boot_program, sizeof(boot_program));

	if (prog_len <= 0)

		return -1;

	aligned_hdr_len = ROUND_UP(sizeof(hdr));

	hdr.start_address = htole32(START_BASE + aligned_hdr_len);

	alligned_prog_len = ROUND_UP(prog_len);

	hdr.copy_size = htole16(aligned_hdr_len + alligned_prog_len);

	if (do_write(1, &hdr, sizeof(hdr)) < 0)

		return -1;

	if (write_zero(1, aligned_hdr_len - sizeof(hdr)) < 0)

		return -1;

	if (do_write(1, boot_program, prog_len) < 0)

		return 1;

	/* Write out the rest of the kernel */

	while (1) {

		prog_len = do_read(0, boot_program, sizeof(boot_program));

		if (prog_len < 0)

			return 1;

		if (prog_len == 0)

			break;

		if (do_write(1, boot_program, prog_len) < 0)

			return 1;

	}

	return 0;

}

ROM-able zImage boot from MMC

-----------------------------

An ROM-able zImage compiled with ZBOOT_ROM_MMCIF may be written to MMC and

SuperH Mobile ARM will to boot directly from the MMCIF hardware block.

This is achieved by the mask ROM loading the first portion of the image into

MERAM and then jumping to it. This portion contains loader code which

copies the entire image to SDRAM and jumps to it. From there the zImage

boot code proceeds as normal, uncompressing the image into its final

location and then jumping to it.

This code has been tested on an AP4EB board using the developer 1A eMMC

boot mode which is configured using the following jumper settings.

The board used for testing required a patched mask ROM in order for

this mode to function.

   8 7 6 5 4 3 2 1

   x|x|x|x|x| |x|

S4 -+-+-+-+-+-+-+-

    | | | | |x| |x on

The zImage must be written to the MMC card at sector 1 (512 bytes) in

vrl4 format. A utility vrl4 is supplied to accomplish this.

e.g.

	vrl4 < zImage | dd of=/dev/sdX bs=512 seek=1

A dual-voltage MMC 4.0 card was used for testing.