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"Das U-Boot" Source Tree
1.. SPDX-License-Identifier: GPL-2.0+:
2
3.. index::
4 single: acpi (command)
5
6acpi command
7============
8
9Synopsis
10--------
11
12::
13
14 acpi list
15 acpi items [-d]
16 acpi dump <name>
17 acpi set <address>
18
19Description
20-----------
21
22The *acpi* command is used to dump the ACPI tables generated by U-Boot for
23passing to the operating systems. It allows manually setting the address to take
24a look at existing ACPI tables.
25
26ACPI tables can be generated by various output functions and even devices can
27output material to include in the Differentiated System Description Table (DSDT)
28and SSDT tables (Secondary System Description Table). U-Boot keeps track of
29which device or table-writer produced each piece of the ACPI tables.
30
31The ACPI tables are stored contiguously in memory.
32
33
34acpi list
35~~~~~~~~~
36
37List the ACPI tables that have been generated. Each table has a 4-character
38table name (e.g. SSDT, FACS) and has a format defined by the
39`ACPI specification`_.
40
41U-Boot does not currently support decoding the tables. Unlike devicetree, ACPI
42tables have no regular schema and also some include bytecode, so decoding the
43tables requires a lot of code.
44
45The table shows the following information:
46
47Name
48 Table name, e.g. `MCFG`
49
50Base
51 Base address of table in memory
52
53Size
54 Size of table in bytes
55
56Detail
57 More information depending on the table type
58
59 Revision
60 Table revision number (two decimal digits)
61
62 OEM ID
63 ID for the Original Equipment Manufacturer. Typically this is "U-BOOT".
64
65 OEM Table ID
66 Table ID for the Original Equipment Manufacturer. Typically this is
67 "U-BOOTBL" (U-Boot bootloader)
68
69 OEM Revision
70 Revision string for the Original Equipment Manufacturer. Typically this
71 is the U-Boot release number, e.g. 20220101 (meaning v2022.01 since the
72 final 01 is not used). For DSDT, this is set by the source code in
73 the parameters of DefinitionBlock().
74
75 ACPI compiler-vendor ID
76 This is normally `INTL` for Intel
77
78 ACPI compiler revision
79 This is the compiler revision. It is set to the version string for the
80 DSDT table but other tables just use the value 0 or 1, since U-Boot does
81 not actually use the compiler in these cases. It generates the code
82 itself.
83
84acpi items
85~~~~~~~~~~
86
87List the ACPI data that was generated, broken down by item. An item is either
88an ACPI table generated by a writer function, or the part of a table that was
89generated by a particular device.
90
91The `-d` flag also shows a binary dump of the table.
92
93The table shows the following information about each item:
94
95Seq
96 Sequence number in hex
97
98Type
99 Type of item
100
101 ===== ============================================================
102 Type Meaning
103 ===== ============================================================
104 dsdt Fragment of a DSDT table, as generated by a device
105 ssdt Fragment of a SSDT table, as generated by a device
106 other A whole table of a particular type. as generated by a writer
107 ===== ============================================================
108
109Base
110 Base address of table in memory
111
112Size
113 Size of table in bytes
114
115Device / Writer
116 Name of device (for ssdt/dsdt) that wrong this fragment of the table, or
117 name of the registered writer function (otherwise) that wrote the table.
118
119acpi dump
120~~~~~~~~~
121
122Dump a paticular ACPI table in binary format. This can be used to read the table
123if you have the specification handy.
124
125
126Example
127-------
128
129::
130
131 => acpi list
132 Name Base Size Detail
133 ---- -------- ----- ------
134 RSDP 79925000 24 v02 U-BOOT
135 RSDT 79925030 48 v01 U-BOOT U-BOOTBL 20220101 INTL 0
136 XSDT 799250e0 6c v01 U-BOOT U-BOOTBL 20220101 INTL 0
137 FACP 79929570 f4 v04 U-BOOT U-BOOTBL 20220101 INTL 1
138 DSDT 79925280 32ea v02 U-BOOT U-BOOTBL 20110725 INTL 20180105
139 FACS 79925240 40
140 MCFG 79929670 2c v01 U-BOOT U-BOOTBL 20220101 INTL 0
141 SPCR 799296a0 50 v02 U-BOOT U-BOOTBL 20220101 INTL 0
142 TPM2 799296f0 4c v04 U-BOOT U-BOOTBL 20220101 INTL 0
143 APIC 79929740 6c v02 U-BOOT U-BOOTBL 20220101 INTL 0
144 SSDT 799297b0 1523 v02 U-BOOT U-BOOTBL 20220101 INTL 1
145 NHLT 7992ace0 e60 v05 coral coral 3 INTL 0
146 DBG2 7992db40 61 v00 U-BOOT U-BOOTBL 20220101 INTL 0
147 HPET 7992dbb0 38 v01 U-BOOT U-BOOTBL 20220101 INTL 0
148 => acpi items
149 Seq Type Base Size Device/Writer
150 --- ----- -------- ---- -------------
151 0 other 79925000 240 0base
152 1 other 79925240 40 1facs
153 2 dsdt 799252a4 58 board
154 3 dsdt 799252fc 10 lpc
155 4 other 79925280 32f0 3dsdt
156 5 other 79928570 1000 4gnvs
157 6 other 79929570 100 5fact
158 7 other 79929670 30 5mcfg
159 8 other 799296a0 50 5spcr
160 9 other 799296f0 50 5tpm2
161 a other 79929740 70 5x86
162 b ssdt 799297d4 fe maxim-codec
163 c ssdt 799298d2 28 i2c2@16,0
164 d ssdt 799298fa 270 da-codec
165 e ssdt 79929b6a 28 i2c2@16,1
166 f ssdt 79929b92 28 i2c2@16,2
167 10 ssdt 79929bba 83 tpm@50
168 11 ssdt 79929c3d 28 i2c2@16,3
169 12 ssdt 79929c65 282 elan-touchscreen@10
170 13 ssdt 79929ee7 285 raydium-touchscreen@39
171 14 ssdt 7992a16c 28 i2c2@17,0
172 15 ssdt 7992a194 d8 elan-touchpad@15
173 16 ssdt 7992a26c 163 synaptics-touchpad@2c
174 17 ssdt 7992a3cf 28 i2c2@17,1
175 18 ssdt 7992a3f7 111 wacom-digitizer@9
176 19 ssdt 7992a508 8f sdmmc@1b,0
177 1a ssdt 7992a597 4b wifi
178 1b ssdt 7992a5e2 1a0 cpu@0
179 1c ssdt 7992a782 1a0 cpu@1
180 1d ssdt 7992a922 1a0 cpu@2
181 1e ssdt 7992aac2 211 cpu@3
182 1f other 799297b0 1530 6ssdt
183 20 other 7992ace0 2f10 8dev
184 => acpi dump mcfg
185 MCFG @ 79929670
186 00000000: 4d 43 46 47 2c 00 00 00 01 41 55 2d 42 4f 4f 54 MCFG,....AU-BOOT
187 00000010: 55 2d 42 4f 4f 54 42 4c 01 01 22 20 49 4e 54 4c U-BOOTBL.." INTL
188 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 ............
189 => acpi items -d
190 Seq Type Base Size Device/Writer
191 --- ----- -------- ---- -------------
192 0 other 79925000 240 0base
193 00000000: 52 53 44 20 50 54 52 20 9e 55 2d 42 4f 4f 54 02 RSD PTR .U-BOOT.
194 00000010: 30 50 92 79 24 00 00 00 e0 50 92 79 00 00 00 00 0P.y$....P.y....
195 00000020: a1 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
196 00000030: 52 53 44 54 48 00 00 00 01 8b 55 2d 42 4f 4f 54 RSDTH.....U-BOOT
197 00000040: 55 2d 42 4f 4f 54 42 4c 01 01 22 20 49 4e 54 4c U-BOOTBL.." INTL
198 00000050: 00 00 00 00 70 95 92 79 70 96 92 79 a0 96 92 79 ....p..yp..y...y
199 00000060: f0 96 92 79 40 97 92 79 b0 97 92 79 e0 ac 92 79 ...y@..y...y...y
200 00000070: 40 db 92 79 b0 db 92 79 00 00 00 00 00 00 00 00 @..y...y........
201 00000080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
202 00000090: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
203 000000a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
204 000000b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
205 000000c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
206 000000d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
207 000000e0: 58 53 44 54 6c 00 00 00 01 61 55 2d 42 4f 4f 54 XSDTl....aU-BOOT
208 000000f0: 55 2d 42 4f 4f 54 42 4c 01 01 22 20 49 4e 54 4c U-BOOTBL.." INTL
209 00000100: 00 00 00 00 70 95 92 79 00 00 00 00 70 96 92 79 ....p..y....p..y
210 00000110: 00 00 00 00 a0 96 92 79 00 00 00 00 f0 96 92 79 .......y.......y
211 00000120: 00 00 00 00 40 97 92 79 00 00 00 00 b0 97 92 79 ....@..y.......y
212 00000130: 00 00 00 00 e0 ac 92 79 00 00 00 00 40 db 92 79 .......y....@..y
213 00000140: 00 00 00 00 b0 db 92 79 00 00 00 00 00 00 00 00 .......y........
214 00000150: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
215 00000160: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
216 ...
217
218 1 other 79925240 40 1facs
219 00000000: 46 41 43 53 40 00 00 00 00 00 00 00 00 00 00 00 FACS@...........
220 00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
221 00000020: 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
222 00000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
223
224 2 dsdt 799252a4 58 board
225 00000000: 10 87 05 00 5c 00 08 4f 49 50 47 12 8c 04 00 03 ....\..OIPG.....
226 00000010: 12 8b 01 00 04 01 01 0e ff ff ff ff ff ff ff ff ................
227 00000020: 0d 49 4e 54 33 34 35 32 3a 30 31 00 12 85 01 00 .INT3452:01.....
228 00000030: 04 0a 03 01 0a 23 0d 49 4e 54 33 34 35 32 3a 30 .....#.INT3452:0
229 00000040: 31 00 12 85 01 00 04 0a 04 01 0a 0a 0d 49 4e 54 1............INT
230 00000050: 33 34 35 32 3a 30 30 00 3452:00.
231
232 3 dsdt 799252fc 10 lpc
233 00000000: 10 8f 00 00 5c 00 08 4e 56 53 41 0c 10 50 93 79 ....\..NVSA..P.y
234
235 4 other 79925280 32f0 3dsdt
236 00000000: 44 53 44 54 ea 32 00 00 02 eb 55 2d 42 4f 4f 54 DSDT.2....U-BOOT
237 00000010: 55 2d 42 4f 4f 54 42 4c 25 07 11 20 49 4e 54 4c U-BOOTBL%.. INTL
238
239This shows searching for tables in a known area of memory, then setting the
240pointer::
241
242 => acpi list
243 No ACPI tables present
244 => ms.s bff00000 80000 "RSD PTR"
245 bff75000: 52 53 44 20 50 54 52 20 cf 42 4f 43 48 53 20 00 RSD PTR .BOCHS .
246 1 match
247 => acpi set bff75000
248 Setting ACPI pointer to bff75000
249 => acpi list
250 Name Base Size Detail
251 ---- -------- ----- ------
252 RSDP bff75000 0 v00 BOCHS
253 RSDT bff76a63 38 v01 BOCHS BXPC 1 BXPC 1
254 FACP bff768ff 74 v01 BOCHS BXPC 1 BXPC 1
255 DSDT bff75080 187f v01 BOCHS BXPC 1 BXPC 1
256 FACS bff75040 40
257 APIC bff76973 90 v01 BOCHS BXPC 1 BXPC 1
258 HPET bff76a03 38 v01 BOCHS BXPC 1 BXPC 1
259 WAET bff76a3b 28 v01 BOCHS BXPC 1 BXPC 1
260 SSDT bff95040 c5 v02 COREv4 COREBOOT 2a CORE 20221020
261
262
263.. _`ACPI specification`: https://uefi.org/sites/default/files/resources/ACPI_6_3_final_Jan30.pdf