[U-Boot] [PATCH V3 1/3] imx-common/cmd_resetmode.c: add imx resetmode command

[stefano babic]

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

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