nextpnr-ice40 seed (extension board, no cache)

	A	B	C	F	J	K	L
1	nextpnr seed	frequency estimate	design works?		arachne-pnr seed	frequency estimate	design works?
2	1	56.68	no (no program output)		1	49.03	yes
3	2	49.54	yes		2	55.87	yes
4	3	54.09	yes		3	54.21	yes
5	4	54.79	yes		4	55.93	yes
6	5	57.22	yes		5	50.54	yes
7	6	50.90	yes		6	54.48	yes
8	7	46.31	yes	Design clocked at 25.125 MHz	7	54.58	yes
9	8	51.84	yes		8	52.32	yes
10	9	53.29	yes		9	52.71	yes
11	10	54.33	yes		10	50.47	yes
12	11	50.99	yes		11	49.59	yes
13	12	51.44	yes		12	56.22	yes
14	13	52.36	yes		13	53.30	yes
15	14	48.60	yes		14	51.88	no (program misbehaves)
16	15	54.02	yes		15	57.56	yes
17	16	54.73	yes		16	50.50	yes
18	17	47.25	yes		17	46.61	yes
19	18	53.54	yes		18	49.94	yes
20	19	52.26	yes		19	53.58	yes
21	20	53.34	yes		20	52.42	yes
22	21	50.61	yes		21	58.38	no (no program output)
23	22	53.80	yes		22	54.90	yes
24	23	54.12	yes		23	48.05	yes
25	24	52.17	yes		24	53.24	yes
26	25	56.41	no (no program output)		25	53.40	yes
27	26	50.49	no (program misbehaves)		26	51.69	yes
28	27	54.85	no (program misbehaves)		27	48.81	yes
29	28	53.38	yes		28	52.40	yes
30	29	51.05	yes		29	52.05	yes
31	30	57.71	yes		30	51.88	yes
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