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annotate gsm-fw/bsp/flashchipinit.S @ 1034:405b5469abc4 default tip

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author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 12 Jun 2016 19:06:34 +0000
parents 2768b4339275
children
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857
2768b4339275 a flash chip init/reset function added to Application_Initialize(),
Space Falcon <falcon@ivan.Harhan.ORG>
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1 /*
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2 * TI's TCS211 firmware is designed to autodetect the flash chip type for
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3 * its FFS, selecting different FFS configurations depending on what flash
2768b4339275 a flash chip init/reset function added to Application_Initialize(),
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4 * chip is found. In our FreeCalypso fw we fix our FFS configuration at
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5 * compile time instead (for us it's more a matter of either mimicking or
2768b4339275 a flash chip init/reset function added to Application_Initialize(),
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6 * working around what the previous firmwares on our target devices do),
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7 * so we have no "proper" place for flash chip type autodetection logic in
2768b4339275 a flash chip init/reset function added to Application_Initialize(),
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8 * our fw architecture.
2768b4339275 a flash chip init/reset function added to Application_Initialize(),
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9 *
2768b4339275 a flash chip init/reset function added to Application_Initialize(),
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10 * However, the following function (to be executed out of IRAM) mimics the
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11 * sequence of flash chip accesses performed by TCS211's flash chip type
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12 * autodetection function. It was added in a stray hope that it might fix
2768b4339275 a flash chip init/reset function added to Application_Initialize(),
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13 * the perplexing crash behavior we see when booting on a GTA02 modem that
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14 * is "hot", i.e., powered off and then back on without giving it a long
2768b4339275 a flash chip init/reset function added to Application_Initialize(),
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15 * time to "cool".
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16 */
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17
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18 .code 32
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19 .text
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20
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21 .globl flash_chip_init
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22 flash_chip_init:
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23 ldr r1, =0x0300AAAA
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24 ldr r2, =0x03005555
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25 ldr r3, =0x03000000
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26 /* read ID mode sequence */
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27 mov r0, #0xAA
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28 strh r0, [r1]
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29 mov r0, #0x55
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30 strh r0, [r2]
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31 mov r0, #0x90
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32 strh r0, [r1]
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33 /* dummy reads */
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34 ldrh r0, [r3, #0]
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35 ldrh r0, [r3, #2]
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36 /* Intel reset command */
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37 mov r0, #0xFF
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38 strh r0, [r3]
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39 /* AMD reset sequence */
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40 mov r0, #0xAA
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41 strh r0, [r1]
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42 mov r0, #0x55
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43 strh r0, [r2]
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44 mov r0, #0xF0
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45 strh r0, [r1]
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46 bx lr