2 * (C) Copyright 2015 Google, Inc
3 * Written by Simon Glass <sjg@chromium.org>
5 * (C) 2017 Theobroma Systems Design und Consulting GmbH
7 * SPDX-License-Identifier: GPL-2.0+
9 * Helper functions for Rockchip images
12 #include "imagetool.h"
18 #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
21 RK_SIGNATURE = 0x0ff0aa55,
25 * struct header0_info - header block for boot ROM
27 * This is stored at SD card block 64 (where each block is 512 bytes, or at
28 * the start of SPI flash. It is encoded with RC4.
30 * @signature: Signature (must be RKSD_SIGNATURE)
31 * @disable_rc4: 0 to use rc4 for boot image, 1 to use plain binary
32 * @init_offset: Offset in blocks of the SPL code from this header
33 * block. E.g. 4 means 2KB after the start of this header.
34 * Other fields are not used by U-Boot
41 uint8_t reserved1[492];
43 uint16_t init_boot_size;
55 * struct spl_info - spl info for each chip
57 * @imagename: Image name(passed by "mkimage -n")
58 * @spl_hdr: Boot ROM requires a 4-bytes spl header
59 * @spl_size: Spl size(include extra 4-bytes spl header)
60 * @spl_rc4: RC4 encode the SPL binary (same key as header)
61 * @spl_boot0: A new-style (ARM_SOC_BOOT0_HOOK) image that should
62 * have the boot magic (e.g. 'RK33') written to its first
67 const char *imagename;
69 const uint32_t spl_size;
74 static struct spl_info spl_infos[] = {
75 { "rk3036", "RK30", 0x1000, false, false },
76 { "rk3188", "RK31", 0x8000 - 0x800, true, false },
77 { "rk3288", "RK32", 0x8000, false, false },
78 { "rk3328", "RK32", 0x8000 - 0x1000, false, false },
79 { "rk3399", "RK33", 0x20000, false, true },
80 { "rv1108", "RK11", 0x1800, false, false},
83 static unsigned char rc4_key[16] = {
84 124, 78, 3, 4, 85, 5, 9, 7,
85 45, 44, 123, 56, 23, 13, 23, 17
88 static struct spl_info *rkcommon_get_spl_info(char *imagename)
95 for (i = 0; i < ARRAY_SIZE(spl_infos); i++)
96 if (!strncmp(imagename, spl_infos[i].imagename, 6))
102 int rkcommon_check_params(struct image_tool_params *params)
106 if (rkcommon_get_spl_info(params->imagename) != NULL)
110 * If this is a operation (list or extract), the don't require
111 * imagename to be set.
113 if (params->lflag || params->iflag)
116 fprintf(stderr, "ERROR: imagename (%s) is not supported!\n",
117 params->imagename ? params->imagename : "NULL");
119 fprintf(stderr, "Available imagename:");
120 for (i = 0; i < ARRAY_SIZE(spl_infos); i++)
121 fprintf(stderr, "\t%s", spl_infos[i].imagename);
122 fprintf(stderr, "\n");
127 const char *rkcommon_get_spl_hdr(struct image_tool_params *params)
129 struct spl_info *info = rkcommon_get_spl_info(params->imagename);
132 * info would not be NULL, because of we checked params before.
134 return info->spl_hdr;
138 int rkcommon_get_spl_size(struct image_tool_params *params)
140 struct spl_info *info = rkcommon_get_spl_info(params->imagename);
143 * info would not be NULL, because of we checked params before.
145 return info->spl_size;
148 bool rkcommon_need_rc4_spl(struct image_tool_params *params)
150 struct spl_info *info = rkcommon_get_spl_info(params->imagename);
153 * info would not be NULL, because of we checked params before.
155 return info->spl_rc4;
158 bool rkcommon_spl_is_boot0(struct image_tool_params *params)
160 struct spl_info *info = rkcommon_get_spl_info(params->imagename);
163 * info would not be NULL, because of we checked params before.
165 return info->spl_boot0;
168 static void rkcommon_set_header0(void *buf, uint file_size,
169 struct image_tool_params *params)
171 struct header0_info *hdr = buf;
173 memset(buf, '\0', RK_INIT_OFFSET * RK_BLK_SIZE);
174 hdr->signature = RK_SIGNATURE;
175 hdr->disable_rc4 = !rkcommon_need_rc4_spl(params);
176 hdr->init_offset = RK_INIT_OFFSET;
178 hdr->init_size = DIV_ROUND_UP(file_size, RK_BLK_SIZE);
180 * The init_size has to be a multiple of 4 blocks (i.e. of 2K)
181 * or the BootROM will not boot the image.
183 * Note: To verify that this is not a legacy constraint, we
184 * rechecked this against the RK3399 BootROM.
186 hdr->init_size = ROUND(hdr->init_size, 4);
188 * init_boot_size needs to be set, as it is read by the BootROM
189 * to determine the size of the next-stage bootloader (e.g. U-Boot
190 * proper), when used with the back-to-bootrom functionality.
192 * see https://lists.denx.de/pipermail/u-boot/2017-May/293267.html
193 * for a more detailed explanation by Andy Yan
195 hdr->init_boot_size = hdr->init_size + RK_MAX_BOOT_SIZE / RK_BLK_SIZE;
197 rc4_encode(buf, RK_BLK_SIZE, rc4_key);
200 int rkcommon_set_header(void *buf, uint file_size,
201 struct image_tool_params *params)
203 struct header1_info *hdr = buf + RK_SPL_HDR_START;
205 if (file_size > rkcommon_get_spl_size(params))
208 rkcommon_set_header0(buf, file_size, params);
210 /* Set up the SPL name (i.e. copy spl_hdr over) */
211 memcpy(&hdr->magic, rkcommon_get_spl_hdr(params), RK_SPL_HDR_SIZE);
213 if (rkcommon_need_rc4_spl(params))
214 rkcommon_rc4_encode_spl(buf, RK_SPL_HDR_START,
215 params->file_size - RK_SPL_HDR_START);
220 static inline unsigned rkcommon_offset_to_spi(unsigned offset)
223 * While SD/MMC images use a flat addressing, SPI images are padded
224 * to use the first 2K of every 4K sector only.
226 return ((offset & ~0x7ff) << 1) + (offset & 0x7ff);
229 static inline unsigned rkcommon_spi_to_offset(unsigned offset)
231 return ((offset & ~0x7ff) >> 1) + (offset & 0x7ff);
234 static int rkcommon_parse_header(const void *buf, struct header0_info *header0,
235 struct spl_info **spl_info)
237 unsigned hdr1_offset;
238 struct header1_info *hdr1_sdmmc, *hdr1_spi;
245 * The first header (hdr0) is always RC4 encoded, so try to decrypt
246 * with the well-known key.
248 memcpy((void *)header0, buf, sizeof(struct header0_info));
249 rc4_encode((void *)header0, sizeof(struct header0_info), rc4_key);
251 if (header0->signature != RK_SIGNATURE)
254 /* We don't support RC4 encoded image payloads here, yet... */
255 if (header0->disable_rc4 == 0)
258 hdr1_offset = header0->init_offset * RK_BLK_SIZE;
259 hdr1_sdmmc = (struct header1_info *)(buf + hdr1_offset);
260 hdr1_spi = (struct header1_info *)(buf +
261 rkcommon_offset_to_spi(hdr1_offset));
263 for (i = 0; i < ARRAY_SIZE(spl_infos); i++) {
264 if (!memcmp(&hdr1_sdmmc->magic, spl_infos[i].spl_hdr, 4)) {
266 *spl_info = &spl_infos[i];
268 } else if (!memcmp(&hdr1_spi->magic, spl_infos[i].spl_hdr, 4)) {
270 *spl_info = &spl_infos[i];
271 return IH_TYPE_RKSPI;
278 int rkcommon_verify_header(unsigned char *buf, int size,
279 struct image_tool_params *params)
281 struct header0_info header0;
282 struct spl_info *img_spl_info, *spl_info;
285 ret = rkcommon_parse_header(buf, &header0, &img_spl_info);
287 /* If this is the (unimplemented) RC4 case, then rewrite the result */
295 * If no 'imagename' is specified via the commandline (e.g. if this is
296 * 'dumpimage -l' w/o any further constraints), we accept any spl_info.
298 if (params->imagename == NULL)
301 /* Match the 'imagename' against the 'spl_hdr' found */
302 spl_info = rkcommon_get_spl_info(params->imagename);
303 if (spl_info && img_spl_info)
304 return strcmp(spl_info->spl_hdr, img_spl_info->spl_hdr);
309 void rkcommon_print_header(const void *buf)
311 struct header0_info header0;
312 struct spl_info *spl_info;
316 ret = rkcommon_parse_header(buf, &header0, &spl_info);
318 /* If this is the (unimplemented) RC4 case, then fail silently */
323 fprintf(stderr, "Error: image verification failed\n");
329 printf("Image Type: Rockchip %s (%s) boot image\n",
331 (image_type == IH_TYPE_RKSD) ? "SD/MMC" : "SPI");
332 printf("Data Size: %d bytes\n", header0.init_size * RK_BLK_SIZE);
335 void rkcommon_rc4_encode_spl(void *buf, unsigned int offset, unsigned int size)
337 unsigned int remaining = size;
339 while (remaining > 0) {
340 int step = (remaining > RK_BLK_SIZE) ? RK_BLK_SIZE : remaining;
342 rc4_encode(buf + offset, step, rc4_key);
343 offset += RK_BLK_SIZE;
348 int rkcommon_vrec_header(struct image_tool_params *params,
349 struct image_type_params *tparams,
350 unsigned int alignment)
352 unsigned int unpadded_size;
353 unsigned int padded_size;
356 * The SPL image looks as follows:
358 * 0x0 header0 (see rkcommon.c)
359 * 0x800 spl_name ('RK30', ..., 'RK33')
360 * (start of the payload for AArch64 payloads: we expect the
361 * first 4 bytes to be available for overwriting with our
363 * 0x804 first instruction to be executed
364 * (start of the image/payload for 32bit payloads)
366 * For AArch64 (ARMv8) payloads, natural alignment (8-bytes) is
367 * required for its sections (so the image we receive needs to
368 * have the first 4 bytes reserved for the spl_name). Reserving
369 * these 4 bytes is done using the BOOT0_HOOK infrastructure.
371 * Depending on this, the header is either 0x800 (if this is a
372 * 'boot0'-style payload, which has reserved 4 bytes at the
373 * beginning for the 'spl_name' and expects us to overwrite
374 * its first 4 bytes) or 0x804 bytes in length.
376 if (rkcommon_spl_is_boot0(params))
377 tparams->header_size = RK_SPL_HDR_START;
379 tparams->header_size = RK_SPL_HDR_START + 4;
381 /* Allocate, clear and install the header */
382 tparams->hdr = malloc(tparams->header_size);
383 memset(tparams->hdr, 0, tparams->header_size);
384 tparams->header_size = tparams->header_size;
387 * If someone passed in 0 for the alignment, we'd better handle
393 unpadded_size = tparams->header_size + params->file_size;
394 padded_size = ROUND(unpadded_size, alignment);
396 return padded_size - unpadded_size;