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initial bits of bootldr driver for U-Boot -- now we are able to query first
stage bootloader about physical memory, flash, serial port speed etc.

#include <uboot.h>
#include <platform.h>

struct uboot_cframe *
uboot_map(uint32_t cframeaddr)
{
	/*
	 * Try to treat UBOOT_CFRAMESIZE bytes at cframeaddr as an u-boot
	 * boot_params (configuration frame). U-Boot signs this region with crc32,
	 * so we can determine if our probe is correct.
	 * Return struct uboot_cframe * on success or NULL otherwise.
	 */

	struct uboot_cframe *ucfp;

	cframeaddr = BOOT_PARAMS;
	ucfp = cframeaddr;

	/* TODO: actually, check crc */
#if 0
	if (crc32((uint8_t *)ucfp, UBOOT_CFRAMESIZE - 4) != ucfp->ucf_crc32)
		return (NULL);
#endif
	printk("uboot_map: map @0x%x; memstart=%x; memsize=%x\n", cframeaddr, ucfp->ucf_memstart, ucfp->ucf_memsize);

	/* CRC ok, probe succeeded */
	return (ucfp);
}