source: rtems/c/src/lib/libbsp/arm/tms570/include/tms570-pom.h @ 8df196f7

5
Last change on this file since 8df196f7 was 870ff8e9, checked in by Pavel Pisa <pisa@…>, on 11/12/15 at 22:11:31

bsp/tms570: use POM only when application image does not start at address 0.

Parameters overlay module is initialized and cleared first.
It is used later to replace exception target vectors
only if that is required.

The application loader code with CPU and SDRAM setup
code has to provide well defined pattern of instructions
at addresses 0x00000000 and 0x0000001f, because only data
read accesses can be processed reliably by POM. The expected
instruction pattern can be seen in the next example

https://github.com/hornmich/tms570ls3137-hdk-sdram/blob/master/SDRAM_SCI_configuration/source/sys_intvecs.asm

Comments with detailed description of code, background
and reasons for selected approach have been included
in TMS570 bsp startup code.

Signed-off-by: Pavel Pisa <pisa@…>
Signed-off-by: Premysl Houdek <kom541000@…>

  • Property mode set to 100644
File size: 1.5 KB
Line 
1/**
2 * @file tms570-pom.h
3 * @ingroup tms570
4 * @brief Parameter Overlay Module (POM) header file
5 */
6
7/*
8 * Copyright (c) 2014 Pavel Pisa <pisa@cmp.felk.cvut.cz>
9 *
10 * Czech Technical University in Prague
11 * Zikova 1903/4
12 * 166 36 Praha 6
13 * Czech Republic
14 *
15 * The license and distribution terms for this file may be
16 * found in the file LICENSE in this distribution or at
17 * http://www.rtems.org/license/LICENSE.
18 */
19
20#ifndef LIBBSP_ARM_TMS570_POM_H
21#define LIBBSP_ARM_TMS570_POM_H
22
23#include <stdint.h>
24#include <bsp/tms570.h>
25
26#ifdef __cplusplus
27extern "C" {
28#endif /* __cplusplus */
29
30#define TMS570_POM_REGIONS 32
31#define TMS570_POM_GLBCTRL_ENABLE 0x000000a0a
32
33/* Specification of memory size used for field REGSIZE of tms570_pom_region_t */
34#define TMS570_POM_REGSIZE_DISABLED 0x0
35#define TMS570_POM_REGSIZE_64B      0x1
36#define TMS570_POM_REGSIZE_128B     0x2
37#define TMS570_POM_REGSIZE_256B     0x3
38#define TMS570_POM_REGSIZE_512B     0x4
39#define TMS570_POM_REGSIZE_1KB      0x5
40#define TMS570_POM_REGSIZE_2KB      0x6
41#define TMS570_POM_REGSIZE_4KB      0x7
42#define TMS570_POM_REGSIZE_8KB      0x8
43#define TMS570_POM_REGSIZE_16KB     0x9
44#define TMS570_POM_REGSIZE_32KB     0xa
45#define TMS570_POM_REGSIZE_64KB     0xb
46#define TMS570_POM_REGSIZE_128KB    0xc
47#define TMS570_POM_REGSIZE_256KB    0xd
48
49#define TMS570_POM_REGADDRMASK    ((1<<23)-1)
50
51void tms570_initialize_and_clear(void);
52void tms570_pom_remap(void);
53
54/** @} */
55
56#ifdef __cplusplus
57}
58#endif /* __cplusplus */
59
60#endif /* LIBBSP_ARM_TMS570_POM_H */
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