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Reverted bootloader optimizations to second iteration. Working on last optimization.

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This commit is contained in:
Jacob Pease 2024-11-02 14:14:31 -05:00
parent e33c2f7a8c
commit 9c39371657
1 changed files with 37 additions and 37 deletions
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74
fpga/zsbl/boot.c
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@ -135,45 +135,45 @@ int disk_read(BYTE * buf, LBA_t sector, UINT count) {
/* crc = crc16(crc, x); */
/* } while (--n > 0); */
/* n = 512/8; */
/* do { */
/* // Send 8 dummy bytes (fifo should be empty) */
/* for (j = 0; j < 8; j++) { */
/* spi_sendbyte(0xff); */
/* } */
/* // Reset counter. Process bytes AS THEY COME IN. */
/* for (j = 0; j < 8; j++) { */
/* while (!(read_reg(SPI_IP) & 2)) {} */
/* uint8_t x = spi_readbyte(); */
/* *p++ = x; */
/* // crc = crc16(crc, x); */
/* crc = ((crc << 8) ^ crctable[x ^ (crc >> 8)]) & 0xffff; */
/* } */
/* } while(--n > 0); */
n = 512;
// Initially fill the transmit fifo
for (j = 0; j < 8; j++) {
spi_sendbyte(0xff);
}
while (n > 0) {
// Wait for bytes to be received
while (!(read_reg(SPI_IP) & 2)) {}
// Read byte
uint8_t x = spi_readbyte();
// Send another dummy byte
if (n > 8) {
n = 512/8;
do {
// Send 8 dummy bytes (fifo should be empty)
for (j = 0; j < 8; j++) {
spi_sendbyte(0xff);
}
// Place received byte into memory
*p++ = x;
// Update CRC16 with fast table based method
crc = ((crc << 8) ^ crctable[x ^ (crc >> 8)]) & 0xffff;
n = n - 1;
}
// Reset counter. Process bytes AS THEY COME IN.
for (j = 0; j < 8; j++) {
while (!(read_reg(SPI_IP) & 2)) {}
uint8_t x = spi_readbyte();
*p++ = x;
// crc = crc16(crc, x);
crc = ((crc << 8) ^ crctable[x ^ (crc >> 8)]) & 0xffff;
}
} while(--n > 0);
/* n = 512; */
/* // Initially fill the transmit fifo */
/* for (j = 0; j < 8; j++) { */
/* spi_sendbyte(0xff); */
/* } */
/* while (n > 0) { */
/* // Wait for bytes to be received */
/* while (!(read_reg(SPI_IP) & 2)) {} */
/* // Read byte */
/* uint8_t x = spi_readbyte(); */
/* // Send another dummy byte */
/* if (n > 8) { */
/* spi_sendbyte(0xff); */
/* } */
/* // Place received byte into memory */
/* *p++ = x; */
/* // Update CRC16 with fast table based method */
/* crc = ((crc << 8) ^ crctable[x ^ (crc >> 8)]) & 0xffff; */
/* n = n - 1; */
/* } */
// Read CRC16 and check
crc_exp = ((uint16_t)spi_dummy() << 8);