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arm: mxs: Add 'Wait for JTAG user' if booted in JTAG mode

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When booting in JTAG mode, there is no way to use soft break-points, and
no way of knowing when SPL has finished executing (so the user can issue
a 'halt' command to load u-boot.bin for example)

Add a debug output and simple loop to stop execution at the completion of
the SPL initialisation as a pseudo break-point when booting in JTAG mode

Signed-off-by: Graeme Russ <gruss@tss-engineering.com>
This commit is contained in:
Graeme Russ 2015-01-25 12:07:53 +11:00 committed by Stefano Babic
parent 7a08603707
commit 2d6286ab79
2 changed files with 22 additions and 0 deletions
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5
arch/arm/cpu/arm926ejs/mxs/spl_boot.c
View File

@ -157,6 +157,11 @@ void mxs_common_spl_init(const uint32_t arg, const uint32_t *resptr,
data->boot_mode_idx = bootmode;
mxs_power_wait_pswitch();
if (mxs_boot_modes[data->boot_mode_idx].boot_pads == MXS_BM_JTAG) {
debug("SPL: Waiting for JTAG user\n");
asm volatile ("x: b x");
}
}
/* Support aparatus */

17
arch/arm/include/asm/arch-mxs/sys_proto.h
View File

@ -74,6 +74,23 @@ static const struct mxs_pair mxs_boot_modes[] = {
#endif
};
#define MXS_BM_USB 0x00
#define MXS_BM_I2C_MASTER_3V3 0x01
#define MXS_BM_I2C_MASTER_1V8 0x11
#define MXS_BM_SPI2_MASTER_3V3_NOR 0x02
#define MXS_BM_SPI2_MASTER_1V8_NOR 0x12
#define MXS_BM_SPI3_MASTER_3V3_NOR 0x03
#define MXS_BM_SPI3_MASTER_1V8_NOR 0x13
#define MXS_BM_NAND_3V3 0x04
#define MXS_BM_NAND_1V8 0x14
#define MXS_BM_JTAG 0x06
#define MXS_BM_SPI3_MASTER_3V3_EEPROM 0x08
#define MXS_BM_SPI3_MASTER_1V8_EEPROM 0x18
#define MXS_BM_SDMMC0_3V3 0x09
#define MXS_BM_SDMMC0_1V8 0x19
#define MXS_BM_SDMMC1_3V3 0x0a
#define MXS_BM_SDMMC1_1V8 0x1a
struct mxs_spl_data {
uint8_t boot_mode_idx;
uint32_t mem_dram_size;