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Merge pull request #876 from trezor/prusnak/boardloader-dma

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core/boardloader: use SRAM as SD card read buffer
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Pavol Rusnak 2020-02-27 12:40:11 +01:00 committed by GitHub
commit d7dbb585e9
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1 changed files with 11 additions and 8 deletions
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19
core/embed/boardloader/main.c
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@ -45,6 +45,10 @@ static const uint8_t * const BOARDLOADER_KEYS[] = {
#endif
};
// we use SRAM as SD card read buffer (because DMA can't access the CCMRAM)
extern uint32_t sram_start[];
#define sdcard_buf sram_start
static uint32_t check_sdcard(void) {
if (sectrue != sdcard_power_on()) {
return 0;
@ -56,12 +60,10 @@ static uint32_t check_sdcard(void) {
return 0;
}
uint32_t buf[IMAGE_HEADER_SIZE / sizeof(uint32_t)];
memzero(buf, sizeof(buf));
memzero(sdcard_buf, IMAGE_HEADER_SIZE);
const secbool read_status =
sdcard_read_blocks(buf, 0, IMAGE_HEADER_SIZE / SDCARD_BLOCK_SIZE);
sdcard_read_blocks(sdcard_buf, 0, IMAGE_HEADER_SIZE / SDCARD_BLOCK_SIZE);
sdcard_power_off();
@ -69,7 +71,7 @@ static uint32_t check_sdcard(void) {
if ((sectrue == read_status) &&
(sectrue ==
load_image_header((const uint8_t *)buf, BOOTLOADER_IMAGE_MAGIC,
load_image_header((const uint8_t *)sdcard_buf, BOOTLOADER_IMAGE_MAGIC,
BOOTLOADER_IMAGE_MAXSIZE, BOARDLOADER_KEY_M,
BOARDLOADER_KEY_N, BOARDLOADER_KEYS, &hdr))) {
return hdr.codelen;
@ -142,13 +144,14 @@ static secbool copy_sdcard(void) {
ensure(sdcard_power_on(), NULL);
uint32_t buf[SDCARD_BLOCK_SIZE / sizeof(uint32_t)];
memzero(sdcard_buf, SDCARD_BLOCK_SIZE);
for (int i = 0; i < (IMAGE_HEADER_SIZE + codelen) / SDCARD_BLOCK_SIZE; i++) {
ensure(sdcard_read_blocks(buf, i, 1), NULL);
ensure(sdcard_read_blocks(sdcard_buf, i, 1), NULL);
for (int j = 0; j < SDCARD_BLOCK_SIZE / sizeof(uint32_t); j++) {
ensure(flash_write_word(FLASH_SECTOR_BOOTLOADER,
i * SDCARD_BLOCK_SIZE + j * sizeof(uint32_t),
buf[j]),
sdcard_buf[j]),
NULL);
}
}