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annotate target-utils/loadagent/binload.c @ 922:3152e23399a2

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document SE K2x0 FFS quirks and our support for them
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 02 Jan 2023 00:50:19 +0000
parents 3229940734e5
children
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3229940734e5 loadagent: binary memload command implemented
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1 /*
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2 * Here we are going to implement our new binary protocol for RAM loading
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3 * for a faster version of fc-xram.
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4 */
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5
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6 #include "types.h"
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7
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8 void
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9 cmd_binary_memload()
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10 {
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11 int state, recptr, extlen, datalen;
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12 u8 record[256], cksum;
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13 u32 addr;
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14 u16 rec_count;
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15 int c, i;
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16
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17 rec_count = 0;
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18 for (state = 0; ; ) {
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19 switch (state) {
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20 case 0:
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21 c = serial_in_timeout(3000000); /* 1.8 s */
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22 if (c < 0 || c == 0x04)
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23 return;
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24 if (c == 0x05) {
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25 serial_out(0x06); /* ACK */
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26 serial_out(rec_count >> 8);
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27 serial_out(rec_count);
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28 continue;
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29 }
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30 if (c >= 6) {
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31 record[0] = c;
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32 extlen = c + 1;
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33 datalen = c - 5;
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34 recptr = 1;
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35 state = 1;
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36 continue;
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37 }
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38 serial_out(0x15); /* NAK */
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39 state = 2;
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40 continue;
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41 case 1:
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42 c = serial_in_timeout(1000000); /* 0.6 s */
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43 if (c < 0) {
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44 serial_out(0x15); /* NAK */
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45 state = 2;
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46 continue;
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47 }
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48 record[recptr++] = c;
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49 if (recptr < extlen)
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50 continue;
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51 /* verify checksum */
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52 cksum = 0;
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53 for (i = 0; i < extlen; i++)
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54 cksum += record[i];
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55 if (cksum != 0xFF) {
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56 serial_out(0x15); /* NAK */
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57 state = 2;
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58 continue;
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59 }
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60 addr = ((u32)record[1] << 24) |
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61 ((u32)record[2] << 16) |
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62 ((u32)record[3] << 8) |
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63 (u32)record[4];
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64 memcpy(addr, record + 5, datalen);
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65 rec_count++;
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66 state = 0;
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67 continue;
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68 default:
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69 c = serial_in_timeout(10000000); /* 6.15 s */
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70 if (c < 0)
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71 return;
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72 serial_out_if_empty(0x15); /* NAK */
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73 continue;
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74 }
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75 }
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76 }