[U-Boot] [PATCH v5] socfpga: Add socfpga preloader signing to mkimage
Charles Manning
cdhmanning at gmail.com
Wed Feb 26 08:42:07 CET 2014
On Wednesday 26 February 2014 19:16:37 Michal Simek wrote:
> On 02/26/2014 02:17 AM, Charles Manning wrote:
> > Like many platforms, the Altera socfpga platform requires that the
> > preloader be "signed" in a certain way or the built-in boot ROM will
> > not boot the code.
> >
> > This change automatically creates an appropriately signed preloader
> > from an SPL image.
> >
> > The signed image includes a CRC which must, of course, be generated
> > with a CRC generator that the SoCFPGA boot ROM agrees with otherwise
> > the boot ROM will reject the image.
> >
> > Unfortunately the CRC used in this boot ROM is not the same as the
> > Adler CRC in lib/crc32.c. Indeed the Adler code is not technically a
> > CRC but is more correctly described as a checksum.
> >
> > Thus, the appropriate CRC generator is added to lib/ as crc32_alt.c.
> >
> > Signed-off-by: Charles Manning <cdhmanning at gmail.com>
> > ---
> >
> > Changes for v3:
> > - Fix some coding style issues.
> > - Move from a standalone tool to the mkimgae framework.
> >
> > Changes for v4:
> > - Fix more coding style issues.
> > - Fix typos in Makefile.
> > - Rebase on master (previous version was not on master, but on a
> > working socfpga branch).
> >
> > Changes for v5:
> > - Fix more coding style issues.
> > - Add some more comments.
> > - Remove some unused defines.
> > - Move the local CRC32 code into lib/crc32_alt.c.
> >
> > Note: Building a SOCFPGA preloader will currently not produe a working
> > image if built in master, but that is due to issues in building SPL,
> > not in this signer.
> >
> >
> > common/image.c | 1 +
> > include/crc32_alt.h | 17 ++++
> > include/image.h | 1 +
> > lib/Makefile | 1 +
> > lib/crc32_alt.c | 94 +++++++++++++++++
> > spl/Makefile | 5 +
> > tools/Makefile | 2 +
> > tools/crc32_alt.c | 1 +
> > tools/imagetool.c | 2 +
> > tools/imagetool.h | 1 +
> > tools/socfpgaimage.c | 276
> > ++++++++++++++++++++++++++++++++++++++++++++++++++ 11 files changed, 401
> > insertions(+)
> > create mode 100644 include/crc32_alt.h
> > create mode 100644 lib/crc32_alt.c
> > create mode 100644 tools/crc32_alt.c
> > create mode 100644 tools/socfpgaimage.c
> >
> > diff --git a/common/image.c b/common/image.c
> > index 9c6bec5..e7dc8cc 100644
> > --- a/common/image.c
> > +++ b/common/image.c
> > @@ -135,6 +135,7 @@ static const table_entry_t uimage_type[] = {
> > { IH_TYPE_PBLIMAGE, "pblimage", "Freescale PBL Boot Image",},
> > { IH_TYPE_RAMDISK, "ramdisk", "RAMDisk Image", },
> > { IH_TYPE_SCRIPT, "script", "Script", },
> > + { IH_TYPE_SOCFPGAIMAGE, "socfpgaimage", "Altera SOCFPGA preloader",},
> > { IH_TYPE_STANDALONE, "standalone", "Standalone Program", },
> > { IH_TYPE_UBLIMAGE, "ublimage", "Davinci UBL image",},
> > { IH_TYPE_MXSIMAGE, "mxsimage", "Freescale MXS Boot Image",},
> > diff --git a/include/crc32_alt.h b/include/crc32_alt.h
> > new file mode 100644
> > index 0000000..813d55d
> > --- /dev/null
> > +++ b/include/crc32_alt.h
> > @@ -0,0 +1,17 @@
> > +/*
> > + * Copyright (C) 2014 Charles Manning <cdhmanning at gmail.com>
> > + *
> > + * SPDX-License-Identifier: GPL-2.0+
> > + *
> > + * Note that the CRC is **not** the zlib/Adler crc32 in crc32.c.
> > + * It is the CRC-32 used in bzip2, ethernet and elsewhere.
> > + */
> > +
> > +#ifndef __CRC32_ALT_H__
> > +#define __CRC32_ALT_H__
> > +
> > +#include <stdint.h>
> > +
> > +uint32_t crc32_alt(uint32_t crc, const void *_buf, int length);
> > +
> > +#endif
> > diff --git a/include/image.h b/include/image.h
> > index 6afd57b..bde31d9 100644
> > --- a/include/image.h
> > +++ b/include/image.h
> > @@ -215,6 +215,7 @@ struct lmb;
> > #define IH_TYPE_KERNEL_NOLOAD 14 /* OS Kernel Image, can run from any
> > load address */ #define IH_TYPE_PBLIMAGE 15 /* Freescale PBL Boot
> > Image */
> > #define IH_TYPE_MXSIMAGE 16 /* Freescale MXSBoot Image */
> > +#define IH_TYPE_SOCFPGAIMAGE 17 /* Altera SOCFPGA Preloader */
> >
> > /*
> > * Compression Types
> > diff --git a/lib/Makefile b/lib/Makefile
> > index 8c483c9..7ee07a5 100644
> > --- a/lib/Makefile
> > +++ b/lib/Makefile
> > @@ -52,6 +52,7 @@ obj-y += errno.o
> > obj-y += display_options.o
> > obj-$(CONFIG_BCH) += bch.o
> > obj-y += crc32.o
> > +obj-y += crc32_alt.o
> > obj-y += ctype.o
> > obj-y += div64.o
> > obj-y += hang.o
> > diff --git a/lib/crc32_alt.c b/lib/crc32_alt.c
> > new file mode 100644
> > index 0000000..e0db335
> > --- /dev/null
> > +++ b/lib/crc32_alt.c
> > @@ -0,0 +1,94 @@
> > +/*
> > + * Copyright (C) 2014 Charles Manning <cdhmanning at gmail.com>
> > + *
> > + * SPDX-License-Identifier: GPL-2.0+
> > + *
> > + * Note that the CRC is **not** the zlib/Adler crc32 in crc32.c.
> > + * It is the CRC-32 used in bzip2, ethernet and elsewhere.
> > + */
> > +
> > +#include <crc32_alt.h>
> > +#include <stdint.h>
> > +
> > +static uint32_t crc_table[256] = {
> > + 0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9,
> > + 0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005,
> > + 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
> > + 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
> > + 0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9,
> > + 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
> > + 0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011,
> > + 0x791d4014, 0x7ddc5da3, 0x709f7b7a, 0x745e66cd,
> > + 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
> > + 0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5,
> > + 0xbe2b5b58, 0xbaea46ef, 0xb7a96036, 0xb3687d81,
> > + 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
> > + 0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49,
> > + 0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
> > + 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
> > + 0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d,
> > + 0x34867077, 0x30476dc0, 0x3d044b19, 0x39c556ae,
> > + 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
> > + 0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16,
> > + 0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca,
> > + 0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
> > + 0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02,
> > + 0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, 0x53dc6066,
> > + 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
> > + 0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e,
> > + 0xbfa1b04b, 0xbb60adfc, 0xb6238b25, 0xb2e29692,
> > + 0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
> > + 0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a,
> > + 0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e,
> > + 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
> > + 0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686,
> > + 0xd5b88683, 0xd1799b34, 0xdc3abded, 0xd8fba05a,
> > + 0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
> > + 0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
> > + 0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f,
> > + 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
> > + 0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47,
> > + 0x36194d42, 0x32d850f5, 0x3f9b762c, 0x3b5a6b9b,
> > + 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
> > + 0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623,
> > + 0xf12f560e, 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7,
> > + 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
> > + 0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f,
> > + 0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
> > + 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
> > + 0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b,
> > + 0x9b3660c6, 0x9ff77d71, 0x92b45ba8, 0x9675461f,
> > + 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
> > + 0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
> > + 0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c,
> > + 0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
> > + 0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24,
> > + 0x119b4be9, 0x155a565e, 0x18197087, 0x1cd86d30,
> > + 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
> > + 0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088,
> > + 0x2497d08d, 0x2056cd3a, 0x2d15ebe3, 0x29d4f654,
> > + 0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
> > + 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c,
> > + 0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18,
> > + 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
> > + 0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0,
> > + 0x9abc8bd5, 0x9e7d9662, 0x933eb0bb, 0x97ffad0c,
> > + 0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
> > + 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4,
> > +};
> > +
> > +uint32_t crc32_alt(uint32_t crc, const void *_buf, int length)
> > +{
> > + const uint8_t *buf = _buf;
> > +
> > + crc ^= ~0;
> > +
> > + while (length--) {
> > + crc = (crc << 8) ^ crc_table[((crc >> 24) ^ *buf) & 0xff];
> > + buf++;
> > + }
> > +
> > + crc ^= ~0;
> > +
> > + return crc;
> > +}
> > diff --git a/spl/Makefile b/spl/Makefile
> > index bf98024..bce9055 100644
> > --- a/spl/Makefile
> > +++ b/spl/Makefile
> > @@ -181,6 +181,11 @@ $(objtree)/SPL : $(obj)/u-boot-spl.bin
> >
> > ALL-y += $(obj)/$(SPL_BIN).bin
> >
> > +$(OBJTREE)/socfpga-signed-preloader.bin: $(obj)/u-boot-spl.bin
> > + $(OBJTREE)/tools/mkimage -T socfpgaimage -d $< $@
> > +
> > +ALL-$(CONFIG_SOCFPGA) += $(OBJTREE)/socfpga-signed-preloader.bin
> > +
> > ifdef CONFIG_SAMSUNG
> > ALL-y += $(obj)/$(BOARD)-spl.bin
> > endif
> > diff --git a/tools/Makefile b/tools/Makefile
> > index dcd49f8..46af0b1 100644
> > --- a/tools/Makefile
> > +++ b/tools/Makefile
> > @@ -71,6 +71,7 @@ RSA_OBJS-$(CONFIG_FIT_SIGNATURE) := rsa-sign.o
> > dumpimage-mkimage-objs := aisimage.o \
> > $(FIT_SIG_OBJS-y) \
> > crc32.o \
> > + crc32_alt.o \
> > default_image.o \
> > fit_image.o \
> > image-fit.o \
> > @@ -85,6 +86,7 @@ dumpimage-mkimage-objs := aisimage.o \
> > os_support.o \
> > pblimage.o \
> > sha1.o \
> > + socfpgaimage.o \
> > ublimage.o \
> > $(LIBFDT_OBJS) \
> > $(RSA_OBJS-y)
> > diff --git a/tools/crc32_alt.c b/tools/crc32_alt.c
> > new file mode 100644
> > index 0000000..3faa222
> > --- /dev/null
> > +++ b/tools/crc32_alt.c
> > @@ -0,0 +1 @@
> > +#include "../lib/crc32_alt.c"
> > diff --git a/tools/imagetool.c b/tools/imagetool.c
> > index 29d2189..1ef20b1 100644
> > --- a/tools/imagetool.c
> > +++ b/tools/imagetool.c
> > @@ -45,6 +45,8 @@ void register_image_tool(imagetool_register_t
> > image_register) init_ubl_image_type();
> > /* Init Davinci AIS support */
> > init_ais_image_type();
> > + /* Init Altera SOCFPGA support */
> > + init_socfpga_image_type();
> > }
> >
> > /*
> > diff --git a/tools/imagetool.h b/tools/imagetool.h
> > index c2c9aea..c4833b1 100644
> > --- a/tools/imagetool.h
> > +++ b/tools/imagetool.h
> > @@ -167,6 +167,7 @@ void init_mxs_image_type(void);
> > void init_fit_image_type(void);
> > void init_ubl_image_type(void);
> > void init_omap_image_type(void);
> > +void init_socfpga_image_type(void);
> >
> > void pbl_load_uboot(int fd, struct image_tool_params *mparams);
> >
> > diff --git a/tools/socfpgaimage.c b/tools/socfpgaimage.c
> > new file mode 100644
> > index 0000000..f9df9ae
> > --- /dev/null
> > +++ b/tools/socfpgaimage.c
> > @@ -0,0 +1,276 @@
> > +/*
> > + * Copyright (C) 2014 Charles Manning <cdhmanning at gmail.com>
> > + *
> > + * SPDX-License-Identifier: GPL-2.0+
> > + *
> > + * Reference doc
> > http://www.altera.com.cn/literature/hb/cyclone-v/cv_5400A.pdf + * Note
> > this doc is not entirely accurate. Of particular interest to us is the +
> > * "header" length field being in U32s and not bytes.
> > + *
> > + * "Header" is a structure of the following format.
> > + * this is positioned at 0x40.
> > + *
> > + * Endian is LSB.
> > + *
> > + * Offset Length Usage
> > + * -----------------------
> > + * 0x40 4 Validation word 0x31305341
> > + * 0x44 1 Version (whatever, zero is fine)
> > + * 0x45 1 Flags (unused, zero is fine)
> > + * 0x46 2 Length (in units of u32, including the end
> > checksum). + * 0x48 2 Zero
> > + * 0x0A 2 Checksum over the heder. NB Not CRC32
> > + *
> > + * At the end of the code we have a 32-bit CRC checksum over whole
> > binary + * excluding the CRC.
> > + *
> > + * Note that the CRC used here is **not** the zlib/Adler crc32. It is
> > the + * CRC-32 used in bzip2, ethernet and elsewhere.
> > + *
> > + * The image is padded out to 64k, because that is what is
> > + * typically used to write the image to the boot medium.
> > + */
> > +
> > +#include <crc32_alt.h>
> > +#include "imagetool.h"
> > +#include <image.h>
> > +
> > +#define HEADER_OFFSET 0x40
> > +#define HEADER_SIZE 0x0C
>
> just 0xC here
>
> > +#define VALIDATION_WORD 0x31305341
> > +#define PADDED_SIZE 0x10000
> > +
> > +static uint8_t buffer[PADDED_SIZE];
> > +
> > +/*
> > + * The header checksum is just a very simple checksum over
> > + * the header area.
> > + * There is still a crc32 over the whole lot.
> > + */
> > +static uint16_t hdr_checksum(const uint8_t *buf, int len)
> > +{
> > + uint16_t ret = 0;
> > + int i;
> > +
> > + for (i = 0; i < len; i++) {
> > + ret += (((uint16_t) *buf) & 0xff);
> > + buf++;
> > + }
> > + return ret;
> > +}
> > +
> > +/*
> > + * Some byte marshalling functions...
> > + * These load or get little endian values to/from the
> > + * buffer.
> > + */
> > +static void load_le16(uint8_t *buf, uint16_t v)
> > +{
> > + buf[0] = (v >> 0) & 0xff;
> > + buf[1] = (v >> 8) & 0xff;
> > +}
> > +
> > +static void load_le32(uint8_t *buf, uint32_t v)
> > +{
> > + buf[0] = (v >> 0) & 0xff;
> > + buf[1] = (v >> 8) & 0xff;
> > + buf[2] = (v >> 16) & 0xff;
> > + buf[3] = (v >> 24) & 0xff;
> > +}
> > +
> > +static uint16_t get_le16(const uint8_t *buf)
> > +{
> > + uint16_t retval;
> > +
> > + retval = (((uint16_t) buf[0]) << 0) |
> > + (((uint16_t) buf[1]) << 8);
> > + return retval;
> > +}
> > +
> > +static uint32_t get_le32(const uint8_t *buf)
> > +{
> > + uint32_t retval;
> > +
> > + retval = (((uint32_t) buf[0]) << 0) |
> > + (((uint32_t) buf[1]) << 8) |
> > + (((uint32_t) buf[2]) << 16) |
> > + (((uint32_t) buf[3]) << 24);
> > + return retval;
> > +}
> > +
> > +static int align4(int v)
> > +{
> > + return ((v + 3) / 4) * 4;
> > +}
> > +
> > +static void build_header(uint8_t *buf,
> > + uint8_t version,
> > + uint8_t flags,
> > + uint16_t length_bytes)
> > +{
> > + memset(buf, 0, HEADER_SIZE);
> > +
> > + load_le32(buf + 0, VALIDATION_WORD);
> > + buf[4] = version;
> > + buf[5] = flags;
> > + load_le16(buf + 6, length_bytes/4);
> > + load_le16(buf + 10, hdr_checksum(buf, 10));
> > +}
> > +
> > +/*
> > + * Perform a rudimentary verification of header and return
> > + * size of image.
> > + */
> > +static int verify_header(const uint8_t *buf)
> > +{
> > + if (get_le32(buf) != VALIDATION_WORD)
> > + return -1;
> > + if (get_le16(buf + 10) != hdr_checksum(buf, 10))
> > + return -1;
> > +
> > + return get_le16(buf+6) * 4;
>
> buf + 6
>
> > +}
> > +
> > +/* Sign the buffer and return the signed buffer size */
> > +static int sign_buffer(uint8_t *buf,
> > + uint8_t version, uint8_t flags,
> > + int len, int pad_64k)
> > +{
> > + uint32_t crcval;
> > +
> > + /* Align the length up */
> > + len = align4(len);
> > +
> > + /* Build header, adding 4 bytes to length to hold the CRC32. */
> > + build_header(buf + HEADER_OFFSET, version, flags, len + 4);
> > +
> > + crcval = crc32_alt(0, buf, len);
> > +
> > + load_le32(buf + len, crcval);
> > +
> > + if (!pad_64k)
> > + return len + 4;
> > +
> > + return PADDED_SIZE;
> > +}
> > +
> > +/* Verify that the buffer looks sane */
> > +static int verify_buffer(const uint8_t *buf)
> > +{
> > + int len; /* Including 32bit CRC */
> > + uint32_t crccalc;
> > +
> > + len = verify_header(buf + HEADER_OFFSET);
> > + if (len < 0)
> > + return -1;
> > + if (len < HEADER_OFFSET || len > PADDED_SIZE)
> > + return -1;
> > +
> > + /* Adjust length, removing CRC */
> > + len -= 4;
> > +
> > + crccalc = crc32_alt(0, buf, len);
> > +
> > + if (get_le32(buf + len) != crccalc)
> > + return -1;
> > +
> > + return 0;
> > +}
> > +
> > +/* mkimage glue functions */
> > +static int socfpgaimage_verify_header(unsigned char *ptr, int
> > image_size, + struct image_tool_params *params)
> > +{
> > + if (image_size != PADDED_SIZE)
> > + return -1;
> > +
> > + return verify_buffer(ptr);
> > +}
> > +
> > +static void socfpgaimage_print_header(const void *ptr)
> > +{
> > + if (verify_buffer(ptr) == 0)
> > + printf("Looks like a sane SOCFPGA preloader\n");
> > + else
> > + printf("Not a sane SOCFPGA preloader\n");
> > +}
> > +
> > +static int socfpgaimage_check_params(struct image_tool_params *params)
> > +{
> > + /* Not sure if we should be accepting fflags */
> > + return (params->dflag && (params->fflag || params->lflag)) ||
> > + (params->fflag && (params->dflag || params->lflag)) ||
> > + (params->lflag && (params->dflag || params->fflag));
> > +}
> > +
> > +static int socfpgaimage_check_image_types(uint8_t type)
> > +{
> > + if (type == IH_TYPE_SOCFPGAIMAGE)
> > + return EXIT_SUCCESS;
> > + else
>
> this else is not needed here.
>
> > + return EXIT_FAILURE;
> > +}
> > +
> > +/*
> > + * To work in with the mkimage framework, we do some ugly stuff...
> > + *
> > + * First, socfpgaimage_vrec_header() is called.
>
> on space here.
>
> > + * We prepend a fake header big enough to make the file PADDED_SIZE.
> > + * This gives us enough space to do what we want later.
> > + *
> > + * Next, socfpgaimage_set_header() is called.
> > + * We fix up the buffer by moving the image to the start of the buffer.
> > + * We now have some room to do what we need (add CRC and padding).
> > + */
> > +
> > +static int data_size;
> > +#define FAKE_HEADER_SIZE (PADDED_SIZE - data_size)
> > +
> > +static int socfpgaimage_vrec_header(struct image_tool_params *params,
> > + struct image_type_params *tparams)
> > +{
> > + struct stat sbuf;
> > +
> > + if (!params->datafile || stat(params->datafile, &sbuf) < 0)
> > + return 0;
> > +
> > + data_size = sbuf.st_size;
> > + tparams->header_size = FAKE_HEADER_SIZE;
> > +
> > + return 0;
>
> That's quite weird that you are returning 0 for both cases.
The history for that is that the usage of vrec_header by mkimage.c changed.
In the branch where this code was developed, I returned FAKE_HEADER_SIZE, but
mkimage.c was ignoring the returned value.
On master, the returned value is used for the post padding size or something,
but is limited to using a 4k. mkimage.c cannot tolerate return values of more
than 4k and will abort the mkimage
I agree the code does look weird and I will rework that to something like:
if (...) {
data_size = ..
tparams->header_size ...
}
return 0;
Thank you for your feedback, most appreciated.
-- CHarles
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