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Fix initialization problem on TQM5200 without SM501

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Patch by Martin Krause, 8 Apr. 2005
This commit is contained in:
Wolfgang Denk 2005-08-18 11:55:22 +02:00
parent 4f562f145a
commit e8aa824eb2
2 changed files with 44 additions and 9 deletions
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3
CHANGELOG
View File

@ -2,6 +2,9 @@
Changes for U-Boot 1.1.4:
======================================================================
* Fix initialization problem on TQM5200 without SM501
Patch by Martin Krause, 8 Apr. 2005
* Add RTC support for STK52XX.200
Patch by Martin Krause, 7 Apr. 2005

50
board/tqm5200/tqm5200.c
View File

@ -425,7 +425,7 @@ int last_stage_init (void)
* Check for SRAM and SRAM size
*/
/* save origianl SRAM content */
/* save original SRAM content */
save = *(volatile u16 *)CFG_CS2_START;
restore = 1;
@ -447,8 +447,7 @@ int last_stage_init (void)
*(vu_long *)MPC5XXX_CS2_STOP = 0x0000FFFF;
restore = 0;
__asm__ volatile ("sync");
}
else if (*(volatile u16 *)(CFG_CS2_START + (1<<19)) == 0xA5A5) {
} else if (*(volatile u16 *)(CFG_CS2_START + (1<<19)) == 0xA5A5) {
/* make sure that we access a mirrored address */
*(volatile u16 *)CFG_CS2_START = 0x1111;
__asm__ volatile ("sync");
@ -461,8 +460,7 @@ int last_stage_init (void)
}
else
puts ("!! possible error in SRAM detection\n");
}
else {
} else {
puts ("SRAM: 1 MB\n");
}
/* restore origianl SRAM content */
@ -497,8 +495,7 @@ int last_stage_init (void)
*(vu_long *)MPC5XXX_CS1_STOP = 0x0000FFFF;
restore = 0;
__asm__ volatile ("sync");
}
else {
} else {
puts ("VGA: SMI501 (Voyager) with 8 MB\n");
}
/* restore origianl FB content */
@ -598,11 +595,46 @@ void video_get_info_str (int line_number, char *info)
#endif
/*
* Returns SM501 register base address. First thing called in the driver.
* Returns SM501 register base address. First thing called in the
* driver. Checks if SM501 is physically present.
*/
unsigned int board_video_init (void)
{
return SM501_MMIO_BASE;
u16 save, tmp;
int restore, ret;
/*
* Check for Grafic Controller
*/
/* save origianl FB content */
save = *(volatile u16 *)CFG_CS1_START;
restore = 1;
/* write test pattern to FB memory */
*(volatile u16 *)CFG_CS1_START = 0xA5A5;
__asm__ volatile ("sync");
/*
* Put a different pattern on the data lines: otherwise they may float
* long enough to read back what we wrote.
*/
tmp = *(volatile u16 *)CFG_FLASH_BASE;
if (tmp == 0xA5A5)
puts ("!! possible error in grafic controller detection\n");
if (*(volatile u16 *)CFG_CS1_START != 0xA5A5) {
/* no grafic controller found */
restore = 0;
ret = 0;
} else {
ret = SM501_MMIO_BASE;
}
if (restore) {
*(volatile u16 *)CFG_CS1_START = save;
__asm__ volatile ("sync");
}
return ret;
}
/*