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1 | |
2 | Summary | |
3 | ======= | |
4 | ||
5 | This README is about U-Boot support for TI's ARM Cortex-A8 based OMAP3 [1] | |
6 | family of SoCs. TI's OMAP3 SoC family contains an ARM Cortex-A8. Additionally, | |
7 | some family members contain a TMS320C64x+ DSP and/or an Imagination SGX 2D/3D | |
8 | graphics processor and various other standard peripherals. | |
9 | ||
10 | Currently the following boards are supported: | |
11 | ||
12 | * OMAP3530 BeagleBoard [2] | |
13 | ||
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14 | * Gumstix Overo [3] |
15 | ||
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16 | * TI EVM [4] |
17 | ||
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18 | * OpenPandora Ltd. Pandora [5] |
19 | ||
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20 | * TI/Logic PD Zoom MDK [6] |
21 | ||
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22 | * TI/Logic PD Zoom 2 [7] |
23 | ||
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24 | * CompuLab Ltd. CM-T35 [8] |
25 | ||
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26 | Build |
27 | ===== | |
28 | ||
29 | * BeagleBoard: | |
30 | ||
31 | make omap3_beagle_config | |
32 | make | |
33 | ||
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34 | * Gumstix Overo: |
35 | ||
36 | make omap3_overo_config | |
37 | make | |
38 | ||
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39 | * TI EVM: |
40 | ||
41 | make omap3_evm_config | |
42 | make | |
43 | ||
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44 | * Pandora: |
45 | ||
46 | make omap3_pandora_config | |
47 | make | |
48 | ||
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49 | * Zoom MDK: |
50 | ||
51 | make omap3_zoom1_config | |
52 | make | |
53 | ||
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54 | * Zoom 2: |
55 | ||
56 | make omap3_zoom2_config | |
57 | make | |
58 | ||
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59 | * CM-T35: |
60 | ||
61 | make cm_t35_config | |
62 | make | |
63 | ||
84d7a017 | 64 | |
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65 | Custom commands |
66 | =============== | |
67 | ||
68 | To make U-Boot for OMAP3 support NAND device SW or HW ECC calculation, U-Boot | |
69 | for OMAP3 supports custom user command | |
70 | ||
71 | nandecc hw/sw | |
72 | ||
73 | To be compatible with NAND drivers using SW ECC (e.g. kernel code) | |
74 | ||
75 | nandecc sw | |
76 | ||
77 | enables SW ECC calculation. HW ECC enabled with | |
78 | ||
79 | nandecc hw | |
80 | ||
81 | is typically used to write 2nd stage bootloader (known as 'x-loader') which is | |
82 | executed by OMAP3's boot rom and therefore has to be written with HW ECC. | |
83 | ||
84 | For all other commands see | |
85 | ||
86 | help | |
87 | ||
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88 | Interfaces |
89 | ========== | |
90 | ||
91 | gpio | |
4c4bb19d | 92 | ---- |
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93 | |
94 | To set a bit : | |
95 | ||
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96 | if (!gpio_request(N, "")) { |
97 | gpio_direction_output(N, 0); | |
98 | gpio_set_value(N, 1); | |
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99 | } |
100 | ||
101 | To clear a bit : | |
102 | ||
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103 | if (!gpio_request(N, "")) { |
104 | gpio_direction_output(N, 0); | |
105 | gpio_set_value(N, 0); | |
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106 | } |
107 | ||
108 | To read a bit : | |
109 | ||
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110 | if (!gpio_request(N, "")) { |
111 | gpio_direction_input(N); | |
112 | val = gpio_get_value(N); | |
113 | gpio_free(N); | |
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114 | } |
115 | if (val) | |
116 | printf("GPIO N is set\n"); | |
117 | else | |
118 | printf("GPIO N is clear\n"); | |
119 | ||
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120 | dma |
121 | --- | |
122 | void omap3_dma_init(void) | |
123 | Init the DMA module | |
124 | int omap3_dma_get_conf_chan(uint32_t chan, struct dma4_chan *config); | |
125 | Read config of the channel | |
126 | int omap3_dma_conf_chan(uint32_t chan, struct dma4_chan *config); | |
127 | Write config to the channel | |
128 | int omap3_dma_conf_transfer(uint32_t chan, uint32_t *src, uint32_t *dst, | |
129 | uint32_t sze) | |
130 | Config source, destination and size of a transfer | |
131 | int omap3_dma_wait_for_transfer(uint32_t chan) | |
132 | Wait for a transfer to end - this hast to be called before a channel | |
133 | or the data the channel transferd are used. | |
134 | int omap3_dma_get_revision(uint32_t *minor, uint32_t *major) | |
135 | Read silicon Revision of the DMA module | |
136 | ||
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137 | NAND |
138 | ==== | |
139 | ||
140 | There are some OMAP3 devices out there with NAND attached. Due to the fact that | |
141 | OMAP3 ROM code can only handle 1-bit hamming ECC for accessing first page | |
142 | (place where SPL lives) we require this setup for u-boot at least when reading | |
143 | the second progam within SPL. A lot of newer NAND chips however require more | |
144 | than 1-bit ECC for the pages, some can live with 1-bit for the first page. To | |
145 | handle this we can switch to another ECC algorithm after reading the payload | |
146 | within SPL. | |
147 | ||
148 | BCH8 | |
149 | ---- | |
150 | ||
151 | To enable hardware assisted BCH8 (8-bit BCH [Bose, Chaudhuri, Hocquenghem]) on | |
152 | OMAP3 devices we can use the BCH library in lib/bch.c. To do so add CONFIG_BCH | |
3f719069 | 153 | and set CONFIG_NAND_OMAP_ECCSCHEME=5 (refer README.nand) for selecting BCH8_SW. |
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154 | The NAND OOB layout is the same as in linux kernel, if the linux kernel BCH8 |
155 | implementation for OMAP3 works for you so the u-boot version should also. | |
156 | When you require the SPL to read with BCH8 there are two more configs to | |
157 | change: | |
158 | ||
159 | * CONFIG_SYS_NAND_ECCPOS (must be the same as .eccpos in | |
160 | GPMC_NAND_HW_BCH8_ECC_LAYOUT defined in | |
161 | arch/arm/include/asm/arch-omap3/omap_gpmc.h) | |
162 | * CONFIG_SYS_NAND_ECCSIZE must be 512 | |
163 | * CONFIG_SYS_NAND_ECCBYTES must be 13 for this BCH8 setup | |
0c872ecd | 164 | |
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165 | Acknowledgements |
166 | ================ | |
167 | ||
36b4e2dd | 168 | OMAP3 U-Boot is based on U-Boot tar ball [9] for BeagleBoard and EVM done by |
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169 | several TI employees. |
170 | ||
171 | Links | |
172 | ===== | |
173 | ||
174 | [1] OMAP3: | |
175 | ||
176 | http://www.ti.com/omap3 (high volume) and | |
177 | http://www.ti.com/omap35x (broad market) | |
178 | ||
179 | [2] OMAP3530 BeagleBoard: | |
180 | ||
181 | http://beagleboard.org/ | |
182 | ||
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183 | [3] Gumstix Overo: |
184 | ||
185 | http://www.gumstix.net/Overo/ | |
186 | ||
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187 | [4] TI EVM: |
188 | ||
189 | http://focus.ti.com/docs/toolsw/folders/print/tmdxevm3503.html | |
190 | ||
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191 | [5] OpenPandora Ltd. Pandora: |
192 | ||
193 | http://openpandora.org/ | |
194 | ||
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195 | [6] TI/Logic PD Zoom MDK: |
196 | ||
197 | http://www.logicpd.com/products/devkit/ti/zoom_mobile_development_kit | |
198 | ||
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199 | [7] TI/Logic PD Zoom 2 |
200 | ||
201 | http://www.logicpd.com/sites/default/files/1012659A_Zoom_OMAP34x-II_MDP_Brief.pdf | |
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202 | |
203 | [8] CompuLab Ltd. CM-T35: | |
204 | ||
205 | http://www.compulab.co.il/t3530/html/t3530-cm-datasheet.htm | |
206 | ||
207 | [9] TI OMAP3 U-Boot: | |
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208 | |
209 | http://beagleboard.googlecode.com/files/u-boot_beagle_revb.tar.gz |