manual update, SPI flash addresses in multiboot mode comments

pull/3/head
Emard 6 years ago
parent de636ea6cd
commit 449dd31d45

@ -232,8 +232,15 @@ and "tinyfpgasp" application can be used to write or read arbitrary
image to FPGA SPI config FLASH.
User bitstream should be uploaded to byte address 0x200000 of SPI config
FLASH. Bootloader itself resites at a0 address 0. Try not to overwrite
it with something else otherwise US1 or JTAG recovery will be required.
FLASH. Bootloader in multiboot mode resides in multiple copies on SPI config
FLASH chip. "primary"
bootloader image is at byte address 0 of SPI config FLASH, "golden"
bootloader image is at 0x140000 address on 45F chip but its location
varies on various sizes of FPGA 12/25/45/85F. At the last 256 bytes of
FLASH are some special FPGA lattice boot state machine commands
(like some primitive CPU assemlby) than setups and controls multiboot
function. Try not to overwrite any of boot realted areas with something
else otherwise US1 or JTAG recovery will be required.
# Programming over JTAG header

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