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comparison duart28/eeprom_rd.c @ 29:a7393d00996a

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fc-duart28-conf: implement check-eeprom
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 09 Sep 2023 19:13:35 +0000
parents
children 8de3891460db
comparison
equal deleted inserted replaced
28:c4b4ebaa2117 29:a7393d00996a
1 /*
2 * This module implements the steps of reading and validating the starting
3 * EEPROM content.
4 */
5
6 #include <sys/types.h>
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <string.h>
10 #include <strings.h>
11 #include <usb.h>
12 #include "../libftmini/eeprom_func.h"
13
14 u_short eeprom[64];
15
16 void
17 read_eeprom(usbh)
18 usb_dev_handle *usbh;
19 {
20 unsigned n;
21
22 for (n = 0; n < 64; n++)
23 eeprom[n] = ftmini_read_eeprom_loc(usbh, n);
24 }
25
26 static void
27 verify_nonblank()
28 {
29 unsigned n;
30
31 for (n = 0; n < 64; n++) {
32 if (eeprom[n] != 0xFFFF)
33 return;
34 }
35 fprintf(stderr, "error: EEPROM is blank (erased?)\n");
36 exit(1);
37 }
38
39 static void
40 verify_eeprom_chksum()
41 {
42 u_short chksum = 0xAAAA;
43 unsigned n;
44
45 for (n = 0; n < 64; n++) {
46 chksum ^= eeprom[n];
47 chksum = (chksum << 1) | (chksum >> 15);
48 }
49 if (chksum == 0)
50 return;
51 fprintf(stderr, "error: EEPROM checksum is wrong\n");
52 exit(1);
53 }
54
55 static int
56 check_req_match()
57 {
58 if (eeprom[0] != 0x0808)
59 return 0;
60 if (eeprom[1] != 0x0403)
61 return 0;
62 if (eeprom[2] != 0x6010 && eeprom[2] != 0x7152)
63 return 0;
64 if (eeprom[3] != 0x0500)
65 return 0;
66 if (eeprom[4] != 0x3280)
67 return 0;
68 if (eeprom[5] != 0x0000 && eeprom[5] != 0x0008)
69 return 0;
70 if (eeprom[6] != 0x0200)
71 return 0;
72 if (eeprom[7] != 0x1896)
73 return 0;
74 if (eeprom[8] != 0x12AE)
75 return 0;
76 if (eeprom[10] != 0x0046)
77 return 0;
78 if (eeprom[11] != 0x0318)
79 return 0;
80 if (eeprom[12] != 'F')
81 return 0;
82 if (eeprom[13] != 'r')
83 return 0;
84 if (eeprom[14] != 'e')
85 return 0;
86 if (eeprom[15] != 'e')
87 return 0;
88 if (eeprom[16] != 'C')
89 return 0;
90 if (eeprom[17] != 'a')
91 return 0;
92 if (eeprom[18] != 'l')
93 return 0;
94 if (eeprom[19] != 'y')
95 return 0;
96 if (eeprom[20] != 'p')
97 return 0;
98 if (eeprom[21] != 's')
99 return 0;
100 if (eeprom[22] != 'o')
101 return 0;
102 if (eeprom[23] != 0x0312)
103 return 0;
104 if (eeprom[24] != 'D')
105 return 0;
106 if (eeprom[25] != 'U')
107 return 0;
108 if (eeprom[26] != 'A')
109 return 0;
110 if (eeprom[27] != 'R')
111 return 0;
112 if (eeprom[28] != 'T')
113 return 0;
114 if (eeprom[29] != '2')
115 return 0;
116 if (eeprom[30] != '8')
117 return 0;
118 if (eeprom[31] != 'C' && eeprom[31] != 'S')
119 return 0;
120 return 1;
121 }
122
123 analyze_eeprom()
124 {
125 verify_nonblank();
126 verify_eeprom_chksum();
127 if (!check_req_match()) {
128 fprintf(stderr,
129 "error: EEPROM content does not match FC DUART28\n");
130 exit(1);
131 }
132 if (eeprom[2] == 0x7152 && eeprom[31] == 'C') {
133 printf("EEPROM is programmed for DUART28C\n");
134 return 'C';
135 }
136 if (eeprom[2] == 0x6010 && eeprom[31] == 'S') {
137 printf("EEPROM is programmed for DUART28S\n");
138 return 'C';
139 }
140 printf("EEPROM is inconsistent between C and S configs!\n");
141 return '?';
142 }