FreeCalypso > hg > freecalypso-citrine
view bsp/flashchipinit.S @ 25:85b080d6fb39
L1/cfile/l1_{cmplx,init}.c: support for feature tch-reroute re-added
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sat, 11 Jun 2016 05:51:09 +0000 |
parents | 75a11d740a02 |
children |
line wrap: on
line source
/* * TI's TCS211 firmware is designed to autodetect the flash chip type for * its FFS, selecting different FFS configurations depending on what flash * chip is found. In our FreeCalypso fw we fix our FFS configuration at * compile time instead (for us it's more a matter of either mimicking or * working around what the previous firmwares on our target devices do), * so we have no "proper" place for flash chip type autodetection logic in * our fw architecture. * * However, the following function (to be executed out of IRAM) mimics the * sequence of flash chip accesses performed by TCS211's flash chip type * autodetection function. It was added in a stray hope that it might fix * the perplexing crash behavior we see when booting on a GTA02 modem that * is "hot", i.e., powered off and then back on without giving it a long * time to "cool". */ .code 32 .text .globl flash_chip_init flash_chip_init: ldr r1, =0x0300AAAA ldr r2, =0x03005555 ldr r3, =0x03000000 /* read ID mode sequence */ mov r0, #0xAA strh r0, [r1] mov r0, #0x55 strh r0, [r2] mov r0, #0x90 strh r0, [r1] /* dummy reads */ ldrh r0, [r3, #0] ldrh r0, [r3, #2] /* Intel reset command */ mov r0, #0xFF strh r0, [r3] /* AMD reset sequence */ mov r0, #0xAA strh r0, [r1] mov r0, #0x55 strh r0, [r2] mov r0, #0xF0 strh r0, [r1] bx lr