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arm_boot: support board IDs more than 16 bits wide

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Support passing a board ID value to the kernel in r1
that is more than 16 bits wide. This is needed to pass
the '-1 == invalid' value for boards which only support
device tree booting.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Tested-by: Mark Langsdorf <mark.langsdorf@calxeda.com>
This commit is contained in:
Peter Maydell 2012-01-26 11:43:48 +00:00
parent 9d5ba9bfbc
commit f8414cb5c8
1 changed files with 5 additions and 6 deletions
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11
hw/arm_boot.c
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@ -20,10 +20,10 @@
/* The worlds second smallest bootloader. Set r0-r2, then jump to kernel. */
static uint32_t bootloader[] = {
0xe3a00000, /* mov r0, #0 */
0xe3a01000, /* mov r1, #0x?? */
0xe3811c00, /* orr r1, r1, #0x??00 */
0xe59f2000, /* ldr r2, [pc, #0] */
0xe59ff000, /* ldr pc, [pc, #0] */
0xe59f1004, /* ldr r1, [pc, #4] */
0xe59f2004, /* ldr r2, [pc, #4] */
0xe59ff004, /* ldr pc, [pc, #4] */
0, /* Board ID */
0, /* Address of kernel args. Set by integratorcp_init. */
0 /* Kernel entry point. Set by integratorcp_init. */
};
@ -301,8 +301,7 @@ void arm_load_kernel(CPUState *env, struct arm_boot_info *info)
} else {
initrd_size = 0;
}
bootloader[1] |= info->board_id & 0xff;
bootloader[2] |= (info->board_id >> 8) & 0xff;
bootloader[4] = info->board_id;
bootloader[5] = info->loader_start + KERNEL_ARGS_ADDR;
bootloader[6] = entry;
for (n = 0; n < sizeof(bootloader) / 4; n++) {