diff options
| author | Eric Sun <jian.sun@freescale.com> | 2011-11-30 13:41:04 +0800 |
|---|---|---|
| committer | Eric Sun <jian.sun@freescale.com> | 2011-11-30 13:54:57 +0800 |
| commit | e696f7dac56591a5616b397bc32a1d9bb57147ee (patch) | |
| tree | b558bae2008bb2b48dea28624cc54927637772f8 /cpu | |
| parent | 127f1cf74be5bdb9eaf18b097aa8605d72ce71f7 (diff) | |
ENGR00163513 MX6Q-UBOOT : Add download_mode cmd
Add "download_mode" command to U-Boot. It will force a system reset and let
boot running in "boot from serial rom" mode, which can be used by manufacturing
tool.
The command will triggle a write to SRC_GPR9 and SRC_GPR10, then triggle a
watchdog reset. GPR9 and GPR10 can maintain their value during the reset, the
value in it make ROM to start in "boot from serial rom" mode. After that GPR9
and GPR10 are written by their original value for normal boot.
Signed-off-by: Eric Sun <jian.sun@freescale.com>
Diffstat (limited to 'cpu')
| -rw-r--r-- | cpu/arm_cortexa8/mx6/generic.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/cpu/arm_cortexa8/mx6/generic.c b/cpu/arm_cortexa8/mx6/generic.c index 175cd03dbbf..8e5c9a66dbb 100644 --- a/cpu/arm_cortexa8/mx6/generic.c +++ b/cpu/arm_cortexa8/mx6/generic.c @@ -889,4 +889,54 @@ int otp_clk_disable(void) return 0; } +#ifdef CONFIG_CMD_IMX_DOWNLOAD_MODE +#define PERSIST_WATCHDOG_RESET_BOOT (0x10000000) +/*BOOT_CFG1[7..4] = 0x3 Boot from Serial ROM (I2C/SPI)*/ +#define BOOT_MODE_SERIAL_ROM (0x00000030) + +/* this function should call before enter linux, otherwise, you + * watchdog reset will enter mfg download mode again, clear this bit + * to prevent this behavior */ +void clear_mfgmode_mem(void) +{ + u32 reg; + reg = readl(SRC_BASE_ADDR + SRC_GPR9); + + reg &= ~BOOT_MODE_SERIAL_ROM; + writel(reg, SRC_BASE_ADDR + SRC_GPR9); + + reg = readl(SRC_BASE_ADDR + SRC_GPR10); + reg &= ~PERSIST_WATCHDOG_RESET_BOOT; + reg = writel(reg, SRC_BASE_ADDR + SRC_GPR10); +} + +void do_switch_mfgmode(void) +{ + u32 reg; + + /* + * During reset, if GPR10[28] is 1, ROM will copy GPR9[25:0] + * to SBMR1, which will determine what is the boot device. + * Here SERIAL_ROM mode is selected + */ + reg = readl(SRC_BASE_ADDR + SRC_GPR9); + reg |= BOOT_MODE_SERIAL_ROM; + writel(reg, SRC_BASE_ADDR + SRC_GPR9); + + reg = readl(SRC_BASE_ADDR + SRC_GPR10); + reg |= PERSIST_WATCHDOG_RESET_BOOT; + writel(reg, SRC_BASE_ADDR + SRC_GPR10); + + /* + * 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", + ""); +#endif |