Commit b90ff0fd authored by Bin Meng's avatar Bin Meng Committed by Simon Glass

cmd: bootvx: Pass E820 information to an x86 VxWorks kernel

E820 is critical to the kernel as it provides system memory map
information. Pass it to an x86 VxWorks kernel.
Signed-off-by: default avatarBin Meng <>
Acked-by: default avatarSimon Glass <>
Reviewed-by: default avatarTom Rini <>
Tested-by: default avatarJian Luo <>
parent 9e98b7e3
......@@ -18,6 +18,9 @@
#include <elf.h>
#include <net.h>
#include <vxworks.h>
#ifdef CONFIG_X86
#include <asm/e820.h>
* A very simple elf loader, assumes the image is valid, returns the
......@@ -214,6 +217,10 @@ int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
char *tmp; /* Temporary char pointer */
char build_buf[128]; /* Buffer for building the bootline */
int ptr = 0;
#ifdef CONFIG_X86
struct e820info *info;
struct e820entry *data;
* Check the loadaddr variable.
......@@ -336,6 +343,29 @@ int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
(char *)bootaddr);
#ifdef CONFIG_X86
* Since E820 information is critical to the kernel, if we don't
* specify these in the environments, use a default one.
tmp = getenv("e820data");
if (tmp)
data = (struct e820entry *)simple_strtoul(tmp, NULL, 16);
data = (struct e820entry *)VXWORKS_E820_DATA_ADDR;
tmp = getenv("e820info");
if (tmp)
info = (struct e820info *)simple_strtoul(tmp, NULL, 16);
info = (struct e820info *)VXWORKS_E820_INFO_ADDR;
memset(info, 0, sizeof(struct e820info));
info->sign = E820_SIGNATURE;
info->entries = install_e820_map(E820MAX, data);
info->addr = (info->entries - 1) * sizeof(struct e820entry) +
* If the data at the load address is an elf image, then
* treat it like an elf image. Otherwise, assume that it is a
......@@ -8,6 +8,35 @@
#ifndef _VXWORKS_H_
#define _VXWORKS_H_
* VxWorks x86 E820 related stuff
* VxWorks on x86 gets E820 information from pre-defined address @
* 0x4a00 and 0x4000. At 0x4a00 it's an information table defined
* by VxWorks and the actual E820 table entries starts from 0x4000.
* As defined by the BIOS E820 spec, the maximum number of E820 table
* entries is 128 and each entry occupies 20 bytes, so it's 128 * 20
* = 2560 (0xa00) bytes in total. That's where VxWorks stores some
* information that is retrieved from the BIOS E820 call and saved
* later for sanity test during the kernel boot-up.
#define VXWORKS_E820_DATA_ADDR 0x4000
#define VXWORKS_E820_INFO_ADDR 0x4a00
/* E820 info signatiure "SMAP" - System MAP */
#define E820_SIGNATURE 0x534d4150
struct e820info {
u32 sign; /* "SMAP" signature */
u32 x0; /* don't care, used by VxWorks */
u32 x1; /* don't care, used by VxWorks */
u32 x2; /* don't care, used by VxWorks */
u32 addr; /* last e820 table entry addr */
u32 x3; /* don't care, used by VxWorks */
u32 entries; /* e820 table entry count */
u32 error; /* must be zero */
int do_bootvx(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
void boot_prep_vxworks(bootm_headers_t *images);
void boot_jump_vxworks(bootm_headers_t *images);
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