* [U-Boot-Users] How can I get board information(u-boot saved) from linux kernel
2005-06-15 3:02 [U-Boot-Users] How can I get board information(u-boot saved) from linux kernel jie han
@ 2005-06-15 13:42 ` Clemens Koller
0 siblings, 0 replies; 2+ messages in thread
From: Clemens Koller @ 2005-06-15 13:42 UTC (permalink / raw)
To: u-boot
Hi, jie!
Well, almost off-topic as you asked in the u-boot-list
But just browse the source: checkout some platform code for i.e.
"bd_t" and "__res"
Depending on your platform, it's picked up in the platform-setup file. i.e.:
in arch/ppc/syslib/ppc4xx_setup.c lines:
218 /*
219 * Input(s):
220 * r3 - Optional pointer to a board information structure.
221 * r4 - Optional pointer to the physical starting address of the init RAM
222 * disk.
223 * r5 - Optional pointer to the physical ending address of the init RAM
224 * disk.
225 * r6 - Optional pointer to the physical starting address of any kernel
226 * command-line parameters.
227 * r7 - Optional pointer to the physical ending address of any kernel
228 * command-line parameters.
229 */
230 void __init
231 ppc4xx_init(unsigned long r3, unsigned long r4, unsigned long r5,
232 unsigned long r6, unsigned long r7)
233 {
234 parse_bootinfo(find_bootinfo());
235
236 /*
237 * If we were passed in a board information, copy it into the
238 * residual data area.
239 */
240 if (r3)
241 __res = *(bd_t *)(r3 + KERNELBASE);
and so on...
-------------------------------
To use it in your code try something like:
#include <linux/init.h>
#include <asm/io.h>
#include <asm/mpc85xx.h>
...
bd_t *binfo=(bd_t *) __res;
DBG("Size of BoardInfo structure: %i\n",sizeof(bd_t));
DBG("CPU Frequency: %luMHz\n",binfo->bi_intfreq/1000000);
DBG("DRAM start: %0lX\n",binfo->bi_memstart);
DBG("DRAM size (bytes): %0lX\n",binfo->bi_memsize);
DBG("FLASH start: %0lX\n",binfo->bi_flashstart);
DBG("FLASH size (bytes): %0lX\n",binfo->bi_flashsize);
DBG("FLASH offset: %0lX\n",binfo->bi_flashoffset);
DBG("SRAM start: %0lX\n",binfo->bi_sramstart);
DBG("SRAM size (bytes): %0lX\n",binfo->bi_sramsize);
DBG("IMMR base: %0lX\n",binfo->bi_immr_base);
DBG("PVR %0X\n",mfspr(PVR));
DBG("SVR %0X\n",mfspr(SVR));
------------------------
But you might consider using the new OpenFirmware structure
to acces bios/boot information on ppc and friends... checkout
the lastest OF Patches for that.
Greets,
Clemens Koller
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jie han wrote:
> I am new to U-Boot, I checked
> file:\include\asm\u-boot.h,it's defined struct
> bd_info,this struct store board information passed to
> linux kernel.How can I get this struct from linux
> kernel?
> If anyone knows of a way to get U-Boot saved board
> information from linux kernel,give me a hint,thanks
> advance.
>
> Sincerely,
>
> Jie
>
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