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rp: Scan for SFDP table on attach 

If no valid program is loaded in the flash then it's ok to read the SFDP
table. This is preferable over the JEDEC ID as it gives us more info.
This commit is contained in:
James Turton 2022-09-04 10:27:36 +02:00 committed by Rachel Mant
parent 027a1779a6
commit 23bc57d02f
1 changed files with 21 additions and 6 deletions
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27
src/target/rp.c
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@ -159,7 +159,7 @@ static bool rp_attach(target *t);
static void rp_flash_prepare(target *t);
static void rp_flash_resume(target *t);
static void rp_spi_read(target *t, uint16_t command, target_addr_t address, void *buffer, size_t length);
static uint32_t rp_get_flash_length(target *t);
static uint32_t rp_get_flash_length(target *t, rp_flash_s *flash);
static bool rp_mass_erase(target *t);
static void rp_spi_read_sfdp(target *const t, const uint32_t address, void *const buffer, const size_t length)
@ -175,10 +175,13 @@ static void rp_add_flash(target *t)
return;
}
flash->page_size = 256U;
flash->sector_erase_opcode = SPI_FLASH_CMD_SECTOR_ERASE;
/* Make some assumptions and hope for the best. */
target_flash_s *const f = &flash->f;
f->start = RP_XIP_FLASH_BASE;
f->length = rp_get_flash_length(t);
f->length = rp_get_flash_length(t, flash);
f->blocksize = 4096U;
f->erase = rp_flash_erase;
f->write = rp_flash_write;
@ -187,9 +190,6 @@ static void rp_add_flash(target *t)
target_add_flash(t, f);
DEBUG_INFO("Flash size: %d MB\n", f->length / (1024U * 1024U));
flash->page_size = 256U;
flash->sector_erase_opcode = SPI_FLASH_CMD_SECTOR_ERASE;
}
bool rp_probe(target *t)
@ -565,7 +565,7 @@ static void rp_spi_read(
target_mem_write32(t, RP_SSI_ENABLE, ssi_enabled);
}
static uint32_t rp_get_flash_length(target *t)
static uint32_t rp_get_flash_length(target *t, rp_flash_s *flash)
{
uint32_t size = MAX_FLASH;
uint32_t bootsec[16];
@ -597,6 +597,21 @@ static uint32_t rp_get_flash_length(target *t)
size = MAX_FLASH;
rp_flash_prepare(t);
spi_parameters_s spi_parameters;
if (sfdp_read_parameters(t, &spi_parameters, rp_spi_read_sfdp)) {
target_flash_s *const f = &flash->f;
f->length = spi_parameters.capacity;
f->blocksize = spi_parameters.sector_size;
flash->page_size = spi_parameters.page_size;
flash->sector_erase_opcode = spi_parameters.sector_erase_opcode;
rp_flash_resume(t);
return spi_parameters.capacity;
}
// We couldn't find the SFDP table so our last chance it to read the JEDEC
// ID and try to decode that.
spi_flash_id_s flash_id;
rp_spi_read(t, SPI_FLASH_CMD_READ_JEDEC_ID, 0, &flash_id, sizeof(flash_id));
rp_flash_resume(t);