bootm.c 1.7 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * (C) Copyright 2003, Psyent Corporation <www.psyent.com>
  4. * Scott McNutt <smcnutt@psyent.com>
  5. */
  6. #include <common.h>
  7. #include <cpu_func.h>
  8. #include <env.h>
  9. #include <image.h>
  10. #include <irq_func.h>
  11. #define NIOS_MAGIC 0x534f494e /* enable command line and initrd passing */
  12. int do_bootm_linux(int flag, int argc, char *const argv[],
  13. bootm_headers_t *images)
  14. {
  15. void (*kernel)(int, int, int, char *) = (void *)images->ep;
  16. char *commandline = env_get("bootargs");
  17. ulong initrd_start = images->rd_start;
  18. ulong initrd_end = images->rd_end;
  19. char *of_flat_tree = NULL;
  20. #if defined(CONFIG_OF_LIBFDT)
  21. /* did generic code already find a device tree? */
  22. if (images->ft_len)
  23. of_flat_tree = images->ft_addr;
  24. #endif
  25. if (!of_flat_tree && argc > 1)
  26. of_flat_tree = (char *)simple_strtoul(argv[1], NULL, 16);
  27. if (of_flat_tree)
  28. initrd_end = (ulong)of_flat_tree;
  29. /*
  30. * allow the PREP bootm subcommand, it is required for bootm to work
  31. */
  32. if (flag & BOOTM_STATE_OS_PREP)
  33. return 0;
  34. if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
  35. return 1;
  36. /* flushes data and instruction caches before calling the kernel */
  37. disable_interrupts();
  38. flush_dcache_all();
  39. debug("bootargs=%s @ 0x%lx\n", commandline, (ulong)&commandline);
  40. debug("initrd=0x%lx-0x%lx\n", (ulong)initrd_start, (ulong)initrd_end);
  41. /* kernel parameters passing
  42. * r4 : NIOS magic
  43. * r5 : initrd start
  44. * r6 : initrd end or fdt
  45. * r7 : kernel command line
  46. * fdt is passed to kernel via r6, the same as initrd_end. fdt will be
  47. * verified with fdt magic. when both initrd and fdt are used at the
  48. * same time, fdt must follow immediately after initrd.
  49. */
  50. kernel(NIOS_MAGIC, initrd_start, initrd_end, commandline);
  51. /* does not return */
  52. return 1;
  53. }