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User's Manual l TQMa6x & TQMa6xP UM 0403 l © 2019, TQ-Systems GmbH
Page 9
3.2.1.6
Boot interfaces
In the next chapters, the configuration of the following boot devices is described:
•
eMMC
•
SPI NOR flash
•
SD card
3.2.1.7
Boot device eMMC
Table 5:
Boot configuration eMMC at uSDHC3
i.MX6
TQMa6x
eFuse
Option
Setting
Signal
Pin
BOOT_CFG1[7]
Boot Device Selection:
01 = Boot from uSDHC Interfaces
0
BOOT_CFG1_7
X2-115
BOOT_CFG1[6]
1
BOOT_CFG1_6
X2-116
BOOT_CFG1[5]
SD / MMC-Selection:
0 = SD / eSD / SDXC
1 = MMC / eMMC
1
BOOT_CFG1_5
X2-117
BOOT_CFG1[4]
Fast Boot Support:
0 = Regular
1 = Fast Boot
0
BOOT_CFG1_4
X2-118
BOOT_CFG1[3]
MMC Speed Mode:
0x = High Speed Mode
1x = Normal Speed Mode
0
BOOT_CFG1_3
X2-119
BOOT_CFG1[2]
0
BOOT_CFG1_2
X2-120
BOOT_CFG1[1]
eMMC Reset Enable:
0 = eMMC-Reset disabled
1 = eMMC-Reset enabled
1
BOOT_CFG1_1
X2-121
BOOT_CFG2[7]
eMMC Bus Width:
000 = 1 bit
001 = 4 bit
010 = 8 bit
101 = 4 bit DDR (MMC 4.4)
110 = 8 bit DDR (MMC 4.4)
0
BOOT_CFG2_7
X2-107
BOOT_CFG2[6]
1
BOOT_CFG2_6
X2-108
BOOT_CFG2[5]
0
BOOT_CFG2_5
X2-109
BOOT_CFG2[4]
Port Select:
00 = uSDHC1
01 = uSDHC2
10 = uSDHC3
11 = uSDHC4
1
BOOT_CFG2_4
X2-110
BOOT_CFG2[3]
0
BOOT_CFG2_3
X2-111
BOOT_CFG2[2]
DLL Override:
0 = Boot ROM
1 = Apply value per eFuse field MMC_DLL_DLY[6:0]
0
BOOT_CFG2_2
X2-112
BOOT_CFG2[1]
Boot Acknowledge:
0 = Boot Acknowledge enable
1 = Boot Acknowledge disable
0
BOOT_CFG2_1
X2-113
BOOT_CFG2[0]
Override Pad Settings:
0 = default values
1 = Use PAD_SETTINGS values
0
BOOT_CFG2_0
X2-114
In addition to the mode listed above the following eMMC modes are supported at port uSDHC3.
Table 6:
uSDHC3 eMMC modes
eMMC mode
1 Bit
4 Bit
8 Bit
Fast Boot
DDR
Normal Speed
–
High Speed
6:
It is not possible to boot from an SPI NOR flash bigger than 16 Mbyte.
7:
Voltage level or condition of eFuse.
8:
Not yet supported by software.