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Increazed fpga clock speed to 35Mhz.

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linux boot is much faster.
This commit is contained in:
Ross Thompson 2022-04-05 15:09:49 -05:00
parent 0ed34b8e63
commit 7abde2b566
2 changed files with 5 additions and 4 deletions
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2
fpga/generator/xlnx_ddr4.tcl
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@ -41,7 +41,7 @@ set_property -dict [list CONFIG.C0.ControllerType {DDR4_SDRAM} \
CONFIG.C0.DDR4_CLKOUT0_DIVIDE {6} \
CONFIG.Reference_Clock {Differential} \
CONFIG.ADDN_UI_CLKOUT1.INSERT_VIP {0} \
CONFIG.ADDN_UI_CLKOUT1_FREQ_HZ {40} \
CONFIG.ADDN_UI_CLKOUT1_FREQ_HZ {35} \
CONFIG.ADDN_UI_CLKOUT2.INSERT_VIP {0} \
CONFIG.ADDN_UI_CLKOUT2_FREQ_HZ {208} \
CONFIG.ADDN_UI_CLKOUT3.INSERT_VIP {0} \

7
pipelined/src/uncore/uartPC16550D.sv
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@ -143,7 +143,7 @@ module uartPC16550D(
LSR <= #1 8'b01100000;
MSR <= #1 4'b0;
if (`FPGA) begin
DLL <= #1 8'd11;
DLL <= #1 8'd38;
DLM <= #1 8'b0;
end else begin
DLL <= #1 8'd1; // this cannot be zero with DLM also zer0.
@ -159,8 +159,9 @@ module uartPC16550D(
3'b000: if (DLAB) DLL <= #1 Din; // else TXHR <= #1 Din; // TX handled in TX register/FIFO section
3'b001: if (DLAB) DLM <= #1 Din; else IER <= #1 Din[3:0];
-----/\----- EXCLUDED -----/\----- */
// *** BUG FIX ME for now for the divider to be 11. Our clock is 23 Mhz. 23Mhz /(25 * 16) = 57600 baud, which is close enough to 57600 baud
3'b000: if (DLAB) DLL <= #1 8'd11; //else TXHR <= #1 Din; // TX handled in TX register/FIFO section
// *** BUG FIX ME for now for the divider to be 38. Our clock is 35 Mhz. 35Mhz /(38 * 16) ~= 57600 baud, which is close enough to 57600 baud
// freq /baud / 16 = div
3'b000: if (DLAB) DLL <= #1 8'd38; //else TXHR <= #1 Din; // TX handled in TX register/FIFO section
3'b001: if (DLAB) DLM <= #1 8'b0; else IER <= #1 Din[3:0];
3'b010: FCR <= #1 {Din[7:6], 2'b0, Din[3], 2'b0, Din[0]}; // Write only FIFO Control Register; 4:5 reserved and 2:1 self-clearing