FreeCalypso > hg > freecalypso-citrine
annotate bsp/flashchipinit.S @ 46:38cf7fa65976
sprintf/float.c: rounding corner case bug
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 29 Sep 2017 03:23:01 +0000 |
parents | 75a11d740a02 |
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rev | line source |
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75a11d740a02
initial import of gsm-fw from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
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1 /* |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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2 * TI's TCS211 firmware is designed to autodetect the flash chip type for |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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3 * its FFS, selecting different FFS configurations depending on what flash |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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4 * chip is found. In our FreeCalypso fw we fix our FFS configuration at |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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5 * compile time instead (for us it's more a matter of either mimicking or |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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6 * working around what the previous firmwares on our target devices do), |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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7 * so we have no "proper" place for flash chip type autodetection logic in |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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8 * our fw architecture. |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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9 * |
75a11d740a02
initial import of gsm-fw from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
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10 * However, the following function (to be executed out of IRAM) mimics the |
75a11d740a02
initial import of gsm-fw from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
parents:
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11 * sequence of flash chip accesses performed by TCS211's flash chip type |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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12 * autodetection function. It was added in a stray hope that it might fix |
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Mychaela Falconia <falcon@freecalypso.org>
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13 * the perplexing crash behavior we see when booting on a GTA02 modem that |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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14 * is "hot", i.e., powered off and then back on without giving it a long |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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15 * time to "cool". |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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16 */ |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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17 |
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Mychaela Falconia <falcon@freecalypso.org>
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18 .code 32 |
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19 .text |
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20 |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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21 .globl flash_chip_init |
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22 flash_chip_init: |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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23 ldr r1, =0x0300AAAA |
75a11d740a02
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24 ldr r2, =0x03005555 |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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25 ldr r3, =0x03000000 |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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26 /* read ID mode sequence */ |
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27 mov r0, #0xAA |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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28 strh r0, [r1] |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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29 mov r0, #0x55 |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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30 strh r0, [r2] |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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31 mov r0, #0x90 |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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32 strh r0, [r1] |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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33 /* dummy reads */ |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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34 ldrh r0, [r3, #0] |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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35 ldrh r0, [r3, #2] |
75a11d740a02
initial import of gsm-fw from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
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36 /* Intel reset command */ |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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37 mov r0, #0xFF |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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38 strh r0, [r3] |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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39 /* AMD reset sequence */ |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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40 mov r0, #0xAA |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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41 strh r0, [r1] |
75a11d740a02
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42 mov r0, #0x55 |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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43 strh r0, [r2] |
75a11d740a02
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44 mov r0, #0xF0 |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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45 strh r0, [r1] |
75a11d740a02
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Mychaela Falconia <falcon@freecalypso.org>
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46 bx lr |