Commit graph

21 commits

Author SHA1 Message Date
Graeme Russ
88fa0a6eb9 x86: Remove usage of %ebp as a return pointer
Using %ebp as a return pointer prevents creating 'load anywhere' images
2010-10-07 20:03:27 +11:00
Graeme Russ
00940a229d x86: Move ECC initialisation outside RAM initialisation
To allow for 'load anywhere' images, the %ebp return pointer 'hack' must
be removed, so we cannot have two 'calls' to get_mem_size
2010-10-07 20:03:26 +11:00
Graeme Russ
6ae032a86a x86: Remove progress indication in low-level init
Progress indication is not relocation friendly so remove it in
preperation for full relocatability support
2010-10-07 20:03:24 +11:00
Graeme Russ
7228efa3cb x86: Fix %ss and %esp in register structure for interrupts 2010-10-07 20:03:23 +11:00
Graeme Russ
5c161653db x86: Change compiler options
Change to:
 - reparam=3
 - no-from-pointer
 - no-stack-protector
 - preferred-stack-boundary=2
 - no-top-level-reorder

These options make the code a little smaller and faster
2010-10-07 20:03:23 +11:00
Graeme Russ
8ffb2e8f33 x86: Coding Style Cleanup
Perform some basic code cleanups of the x86 files
2010-10-07 20:03:21 +11:00
Graeme Russ
59c6d0ef9a x86: Move loading of GTD to C code
Linux has C macros and code to load the GTD after switching to Protected
Mode. Using these greatly simplifies the assembler code
2010-10-07 20:03:21 +11:00
Graeme Russ
797960fda1 x86: Fix x86 Cold Boot
Commit 077e1958ca broke the ability of the
x86 port to boot from a cold-reset by removing the initial IDT. Re-
instate the initial IDT to allow cold-booting of x86 boards
2010-09-13 07:20:02 +10:00
Wolfgang Denk
54841ab50c Make sure that argv[] argument pointers are not modified.
The hush shell dynamically allocates (and re-allocates) memory for the
argument strings in the "char *argv[]" argument vector passed to
commands.  Any code that modifies these pointers will cause serious
corruption of the malloc data structures and crash U-Boot, so make
sure the compiler can check that no such modifications are being done
by changing the code into "char * const argv[]".

This modification is the result of debugging a strange crash caused
after adding a new command, which used the following argument
processing code which has been working perfectly fine in all Unix
systems since version 6 - but not so in U-Boot:

int main (int argc, char **argv)
{
	while (--argc > 0 && **++argv == '-') {
/* ====> */	while (*++*argv) {
			switch (**argv) {
			case 'd':
				debug++;
				break;
			...
			default:
				usage ();
			}
		}
	}
	...
}

The line marked "====>" will corrupt the malloc data structures and
usually cause U-Boot to crash when the next command gets executed by
the shell.  With the modification, the compiler will prevent this with
an
	error: increment of read-only location '*argv'

N.B.: The code above can be trivially rewritten like this:

	while (--argc > 0 && **++argv == '-') {
		char *arg = *argv;
		while (*++arg) {
			switch (*arg) {
			...

Signed-off-by: Wolfgang Denk <wd@denx.de>
Acked-by: Mike Frysinger <vapier@gentoo.org>
2010-07-04 23:55:42 +02:00
Graeme Russ
1f9f3cf6cc sc520: Fix minor DRAM Controller Setup bug
Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
2010-05-06 00:20:56 +02:00
Graeme Russ
d20053efdf sc520: Update to new AMD Copyright
AMD recently changed the licensing of the RAM sizing code to the
GPLv2 (or at your option any later version)

Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
2010-05-06 00:20:44 +02:00
Graeme Russ
21e67e796b sc520: Board Specific PCI Init
Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
2010-05-06 00:18:52 +02:00
Graeme Russ
5204566e53 sc520: Allow boards to override udelay
If the board has a high precision mico-second timer, it maked sense to use
it instead of the on-chip one

Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
2010-05-06 00:17:37 +02:00
Graeme Russ
bf16500f79 x86: Use CONFIG_SERIAL_MULTI
Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
2010-05-06 00:16:46 +02:00
Graeme Russ
c14a3669b2 x86: Move GDT to a safe location in RAM
Currently, the GDT is either located in FLASH or in the non-relocated
U-Boot image in RAM. Both of these locations are unsafe as those
locations can be erased during a U-Boot update. Move the GDT into the
highest available memory location and relocate U-Boot to just below it

Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
2010-05-06 00:15:43 +02:00
Graeme Russ
077e1958ca x86: Add RAM bootstrap functionality
Add a parameter to the 32-bit entry to indicate if entry is from Real
Mode or not. If entry is from Real Mode, execute the destructive 'sizer'
routine to determine memory size as we are booting cold and running in
Flash. If not entering from Real Mode, we are executing a U-Boot image
from RAM and therefore the memory size is already known (and running
'sizer' will destroy the running image)

There are now two 32-bit entry points. The first is the 'in RAM' entry
point which exists at the start of the U-Boot binary image. As such,
you can load u-boot.bin in RAM and jump directly to the load address
without needing to calculate any offsets. The second entry point is
used by the real-to-protected mode switch

This patch also changes TEXT_BASE to 0x6000000 (in RAM). You can load
the resulting image at 0x6000000 and simple go 0x6000000 from the u-boot
prompt

Hopefully a later patch will completely elliminate any dependency on
TEXT_BASE like a relocatable linux kernel (perfect world)

Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
2010-05-06 00:15:31 +02:00
Graeme Russ
759598f82f x86: Split sc520 memory sizing versus reporting
This patch allows the low-level assembler boot-strap to obtain the RAM
size without calling the destructive 'sizer' routine. This allows
boot-strapping from a U-Boot image loaded in RAM

Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
2010-05-06 00:14:44 +02:00
Graeme Russ
4dba333b3c x86: Fix sc520 memory size reporting
There is an error in how the assembler version of the sc520 memory size
reporting code works. As a result, it will only ever report at most the
size of one bank of RAM

Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
2010-05-06 00:14:32 +02:00
Graeme Russ
433ff2bdbc x86: Add register dump to crash handlers
Shamelessly steal the Linux x86 crash handling code and shove it into
U-Boot (cool - it fits). Be sure to include suitable attribution to
Linus

Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
2010-05-06 00:14:00 +02:00
Graeme Russ
64a0a4995e x86: Fix MMCR Access
Change sc520 MMCR Access to use memory accessor functions

Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
2010-05-06 00:13:48 +02:00
Peter Tyser
e9a882803e i386: Move cpu/i386/* to arch/i386/cpu/*
Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
2010-04-13 09:13:26 +02:00