Commit cc1ef76f authored by Paul Sokolovsky's avatar Paul Sokolovsky
Browse files

esp8266/scripts/flashbdev: Correct bootloader flash size to match real size.

Flash size as seen by vendor SDK doesn't depend on real size, but rather on
a particular value in firmware header, as put there by flash tool. That means
it's user responsibility to know what flash size a particular device has, and
specify correct parameters during flashing. That's not end user friendly
however, so we try to make it "flash and play" by detecting real size vs
from-header size mismatch, and correct the header accordingly.
parent 58440688
......@@ -26,6 +26,40 @@ class FlashBdev:
if op == 5: # BP_IOCTL_SEC_SIZE
return self.SEC_SIZE
def set_bl_flash_size(real_size):
if real_size == 256*1024:
code = 1
elif real_size == 512*1024:
code = 0
elif real_size == 1024*1024:
code = 2
elif real_size == 2048*1024:
code = 3
elif real_size == 4096*1024:
code = 4
else:
code = 2
buf = bytearray(4096)
esp.flash_read(0, buf)
buf[3] = (buf[3] & 0xf) | (code << 4)
esp.flash_erase(0)
esp.flash_write(0, buf)
# If bootloader size ID doesn't correspond to real Flash size,
# fix bootloader value and reboot.
size = esp.flash_id() >> 16
# Check that it looks like realistic power of 2 for flash sizes
# commonly used with esp8266
if 22 >= size >= 18:
size = 1 << size
if size != esp.flash_size():
import machine
import time
print("Bootloader Flash size appear to have been set incorrectly, trying to fix")
set_bl_flash_size(size)
machine.reset()
while 1: time.sleep(1)
if esp.flash_size() < 1024*1024:
bdev = None
else:
......
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