xref: /openbmc/u-boot/include/configs/iot_devkit.h (revision 748ad078)
1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * Copyright (C) 2018 Synopsys, Inc. All rights reserved.
4  */
5 
6 #ifndef _CONFIG_IOT_DEVKIT_H_
7 #define _CONFIG_IOT_DEVKIT_H_
8 
9 #include <linux/sizes.h>
10 
11 /*
12  *                         MEMORY MAP
13  *
14  * eFlash: 0x0000_0000 - 0x0008_0000 (512K)
15  *   ICCM: 0x2000_0000 - 0x2004_0000 (256K)
16  *   SRAM: 0x3000_0000 - 0x3002_0000 (128K)
17  *   DCCM: 0x8000_0000 - 0x8002_0000 (128K)
18  *     Note: only data goes here, as IFQ cannot fetch instructions from DCCM
19  *
20  *
21  *                         RAM PARTITIONING
22  *
23  *   +-----------+----------+---------------------+-------------+
24  *   | <-- Stack |  .data   | Malloc              | Environment |
25  *   +-----------+----------+---------------------+-------------+
26  *   :           :          :                     :\___________/
27  *   :           :          :                     :      |
28  *   :           :          :                     :     CONFIG_ENV_SIZE
29  *   :           :           \____________________/
30  *   :           :                     |
31  *   :           :                    CONFIG_SYS_MALLOC_LEN
32  *   :           :
33  *   :          Specified explicitly by CONFIG_SYS_INIT_SP_ADDR
34  *   :
35  *  Specified explicitly by CONFIG_SYS_SDRAM_BASE
36  *
37  *  NOTES:
38  *    - Stack starts from CONFIG_SYS_INIT_SP_ADDR and grows down,
39  *      i.e. towards CONFIG_SYS_SDRAM_BASE but nothing stops it from crossing
40  *      that CONFIG_SYS_SDRAM_BASE in which case data won't be really saved on
41  *      stack any longer and values popped from stack will contain garbage
42  *      leading to unexpected behavior, typically but not limited to:
43  *        - "Returning" back to bogus caller function
44  *        - Reading data from weird addresses
45  */
46 
47 #define CONFIG_SYS_MONITOR_BASE		CONFIG_SYS_TEXT_BASE
48 
49 #define SRAM_BASE			0x30000000
50 #define SRAM_SIZE			SZ_128K
51 
52 #define DCCM_BASE			0x80000000
53 #define DCCM_SIZE			SZ_128K
54 
55 #define CONFIG_SYS_SDRAM_BASE		DCCM_BASE
56 #define CONFIG_SYS_SDRAM_SIZE		DCCM_SIZE
57 
58 #define CONFIG_SYS_INIT_SP_ADDR		(CONFIG_SYS_SDRAM_BASE + SZ_32K)
59 
60 #define CONFIG_SYS_MALLOC_LEN		SZ_64K
61 #define CONFIG_SYS_BOOTM_LEN		SZ_128K
62 #define CONFIG_SYS_LOAD_ADDR		SRAM_BASE
63 
64 #define ROM_BASE			CONFIG_SYS_MONITOR_BASE
65 #define ROM_SIZE			SZ_256K
66 
67 #define RAM_DATA_BASE			CONFIG_SYS_INIT_SP_ADDR
68 #define RAM_DATA_SIZE			CONFIG_SYS_SDRAM_SIZE - \
69 					(CONFIG_SYS_INIT_SP_ADDR - \
70 					CONFIG_SYS_SDRAM_BASE) - \
71 					CONFIG_SYS_MALLOC_LEN - \
72 					CONFIG_ENV_SIZE
73 
74 /*
75  * Environment
76  */
77 #define CONFIG_BOOTFILE			"app.bin"
78 #define CONFIG_LOADADDR			CONFIG_SYS_LOAD_ADDR
79 
80 #endif /* _CONFIG_IOT_DEVKIT_H_ */
81