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openFPGALoader
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gowin: add support for GW2A 

GW2A has no internal flash, and it uses a yet unknown checksum
algorithm.

Support it by forcing external flash and skip checksum check now.

Signed-off-by: Icenowy Zheng <uwu@icenowy.me>
This commit is contained in:
Icenowy Zheng 2022-06-16 09:52:44 +08:00
parent 82c17f6a7d
commit fe0b4d347b
2 changed files with 31 additions and 14 deletions
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44
src/gowin.cpp
View File

@ -141,6 +141,18 @@ Gowin::Gowin(Jtag *jtag, const string filename, const string &file_type,
_spi_do = BSCAN_GW1NSR_4C_SPI_DO;
_spi_msk = BSCAN_GW1NSR_4C_SPI_MSK;
}
/*
* GW2 series has no internal flash and uses new bitstream checksum
* algorithm that is not yet supported.
*/
switch (idcode) {
case 0x0000081b: /* GW2A(R)-18(C) */
case 0x0000281b: /* GW2A(R)-55(C) */
_external_flash = true;
/* FIXME: implement GW2 checksum calculation */
skip_checksum = true;
};
}
Gowin::~Gowin()
@ -193,13 +205,15 @@ void Gowin::programFlash()
usleep(2*150*1000);
/* check if file checksum == checksum in FPGA */
status = readUserCode();
int checksum = static_cast<FsParser *>(_fs)->checksum();
if (checksum != status) {
printError("CRC check : FAIL");
printf("%04x %04x\n", checksum, status);
} else {
printSuccess("CRC check: Success");
if (!skip_checksum) {
status = readUserCode();
int checksum = static_cast<FsParser *>(_fs)->checksum();
if (checksum != status) {
printError("CRC check : FAIL");
printf("%04x %04x\n", checksum, status);
} else {
printSuccess("CRC check: Success");
}
}
if (_verbose)
@ -276,13 +290,15 @@ void Gowin::program(unsigned int offset, bool unprotect_flash)
return;
/* check if file checksum == checksum in FPGA */
status = readUserCode();
uint32_t checksum = static_cast<FsParser *>(_fs)->checksum();
if (checksum != status) {
printError("SRAM Flash: FAIL");
printf("%04x %04x\n", checksum, status);
} else {
printSuccess("SRAM Flash: Success");
if (!skip_checksum) {
status = readUserCode();
uint32_t checksum = static_cast<FsParser *>(_fs)->checksum();
if (checksum != status) {
printError("SRAM Flash: FAIL");
printf("%04x %04x\n", checksum, status);
} else {
printSuccess("SRAM Flash: Success");
}
}
if (_verbose)
displayReadReg(readStatusReg());

1
src/gowin.hpp
View File

@ -54,6 +54,7 @@ class Gowin: public Device, SPIInterface {
uint32_t readUserCode();
ConfigBitstreamParser *_fs;
bool is_gw1n1;
bool skip_checksum;
bool _external_flash; /**< select between int or ext flash */
uint8_t _spi_sck; /**< clk signal offset in bscan SPI */
uint8_t _spi_cs; /**< cs signal offset in bscan SPI */