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Benoît Thébaudeaueec3f022013-04-23 10:17:47 +00001U-Boot for Freescale i.MX6
2
3This file contains information for the port of U-Boot to the Freescale i.MX6
4SoC.
5
61. CONVENTIONS FOR FUSE ASSIGNMENTS
7-----------------------------------
8
91.1 MAC Address: It is stored in fuse bank 4, with the 32 lsbs in word 2 and the
Ye Lid4d1dd62016-02-01 10:41:31 +080010 16 msbs in word 3[15:0].
11 For i.MX6SX and i.MX6UL, they have two MAC addresses. The second MAC address
12 is stored in fuse bank 4, with the 16 lsb in word 3[31:16] and the 32 msbs in
13 word 4.
Fabio Estevam6f3bef92013-12-23 13:07:17 -020014
15Example:
16
17For reading the MAC address fuses on a MX6Q:
18
19- The MAC address is stored in two fuse addresses (the fuse addresses are
20described in the Fusemap Descriptions table from the mx6q Reference Manual):
21
220x620[31:0] - MAC_ADDR[31:0]
230x630[15:0] - MAC_ADDR[47:32]
24
25In order to use the fuse API, we need to pass the bank and word values, which
26are calculated as below:
27
28Fuse address for the lower MAC address: 0x620
29Base address for the fuses: 0x400
30
31(0x620 - 0x400)/0x10 = 0x22 = 34 decimal
32
33As the fuses are arranged in banks of 8 words:
34
3534 / 8 = 4 and the remainder is 2, so in this case:
36
37bank = 4
38word = 2
39
Bin Menga1875592016-02-05 19:30:11 -080040And the U-Boot command would be:
Fabio Estevam6f3bef92013-12-23 13:07:17 -020041
42=> fuse read 4 2
43Reading bank 4:
44
45Word 0x00000002: 9f027772
46
47Doing the same for the upper MAC address:
48
49Fuse address for the upper MAC address: 0x630
50Base address for the fuses: 0x400
51
52(0x630 - 0x400)/0x10 = 0x23 = 35 decimal
53
54As the fuses are arranged in banks of 8 words:
55
5635 / 8 = 4 and the remainder is 3, so in this case:
57
58bank = 4
59word = 3
60
Bin Menga1875592016-02-05 19:30:11 -080061And the U-Boot command would be:
Fabio Estevam6f3bef92013-12-23 13:07:17 -020062
63=> fuse read 4 3
64Reading bank 4:
65
66Word 0x00000003: 00000004
67
68,which matches the ethaddr value:
69=> echo ${ethaddr}
7000:04:9f:02:77:72
71
72Some other useful hints:
73
74- The 'bank' and 'word' numbers can be easily obtained from the mx6 Reference
75Manual. For the mx6quad case, please check the "46.5 OCOTP Memory Map/Register
76Definition" from the "i.MX 6Dual/6Quad Applications Processor Reference Manual,
77Rev. 1, 04/2013" document. For example, for the MAC fuses we have:
78
79Address:
8021B_C620 Value of OTP Bank4 Word2 (MAC Address)(OCOTP_MAC0)
81
8221B_C630 Value of OTP Bank4 Word3 (MAC Address)(OCOTP_MAC1)
83
84- The command '=> fuse read 4 2 2' reads the whole MAC addresses at once:
85
86=> fuse read 4 2 2
87Reading bank 4:
88
89Word 0x00000002: 9f027772 00000004
Stefano Babic40f48392015-12-11 17:30:42 +010090
912. Using imx_usb_loader for first install with SPL
92--------------------------------------------------
93
Fabio Estevam112d59a2016-09-02 17:16:45 -030094imx_usb_loader is a very nice tool by Boundary Devices that
Stefano Babic40f48392015-12-11 17:30:42 +010095allow to install U-Boot without a JTAG debugger, using
96the USB boot mode as described in the manual. It is
97a replacement for Freescale's MFGTOOLS.
98
99The sources can be found here:
100
101 https://github.com/boundarydevices/imx_usb_loader.git
102
103Booting in USB mode, the i.MX6 announces itself to the Linux Host as:
104
105Bus 001 Device 111: ID 15a2:0061 Freescale Semiconductor, Inc.
106
107imx_usb_loader is able to download a single file (u-boot.imx)
108to the board. For boards without SPL support, it is enough to
109issue the command:
110
111 sudo ../imx_usb_loader/imx_usb -v u-boot.imx
112
Fabio Estevam626365b2017-09-20 11:21:49 -0300113In order to load SPL and u-boot.img via imx_usb_loader tool,
114please refer to doc/README.sdp.
Sven Ebenfeld3de6c7f2016-11-06 16:37:57 +0100115