Am 09/08/2012 20:48, schrieb Troy Kisky:
Maybe I am searching in wrong places. Where can I find the description for the feature you have implemented ?
The only documentations I've found are in the freescale release of u-boot. cpu/arm_cortexa8/mx53/generic.c
void do_switch_mfgmode(void) { u32 reg; reg = readl(SRTC_BASE_ADDR + SRTC_LPGR); /* After set bit 28 of LPGR register of SRTC to 1, Set bit * [25:0] to specified value according to format of SBMR, * after trigger a watchdog reset, ROM will read Bit 28 and * then copy bit [25:0] of LPGR to SBMR, then ROM can enter * serial download mode.*/ reg |= 0x12000000; writel(reg, SRTC_BASE_ADDR + SRTC_LPGR); /* this watchdog reset will let chip enter mfgtool download * mode. */ do_reset(NULL, 0, 0, NULL); }
U_BOOT_CMD( download_mode, 1, 1, do_switch_mfgmode, "download_mode - enter i.MX serial/usb download mode\n", "");
and for mx6q by disassembling iMX6DQ_SPI_to_uSDHC3.bin and iMX6DQ_SPI_to_uSDHC4.bin
Well, it is sounds odd that we have to do reverse-engineering to implement features. Can some Freescalers here point out to some docs ? This feature is surely very useful - any hints to have more information ?
Best regards, Stefano Babic