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hw/xtensa/xtfpga: implement DTB loading

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Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2014-06-23 18:45:43 +04:00
parent 364d480242
commit 996dfe98ed
1 changed files with 23 additions and 0 deletions
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23
hw/xtensa/xtfpga.c
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@ -37,6 +37,7 @@
#include "hw/block/flash.h"
#include "sysemu/blockdev.h"
#include "sysemu/char.h"
#include "sysemu/device_tree.h"
#include "qemu/error-report.h"
#include "bootparam.h"
@ -178,6 +179,7 @@ static void lx_init(const LxBoardDesc *board, MachineState *machine)
const char *cpu_model = machine->cpu_model;
const char *kernel_filename = qemu_opt_get(machine_opts, "kernel");
const char *kernel_cmdline = qemu_opt_get(machine_opts, "append");
const char *dtb_filename = qemu_opt_get(machine_opts, "dtb");
int n;
if (!cpu_model) {
@ -246,6 +248,9 @@ static void lx_init(const LxBoardDesc *board, MachineState *machine)
.start = tswap32(0),
.end = tswap32(machine->ram_size),
};
uint32_t lowmem_end = machine->ram_size < 0x08000000 ?
machine->ram_size : 0x08000000;
uint32_t cur_lowmem = QEMU_ALIGN_UP(lowmem_end / 2, 4096);
rom = g_malloc(sizeof(*rom));
memory_region_init_ram(rom, NULL, "lx60.sram", board->sram_size);
@ -255,6 +260,9 @@ static void lx_init(const LxBoardDesc *board, MachineState *machine)
if (kernel_cmdline) {
bp_size += get_tag_size(strlen(kernel_cmdline) + 1);
}
if (dtb_filename) {
bp_size += get_tag_size(sizeof(uint32_t));
}
/* Put kernel bootparameters to the end of that SRAM */
tagptr = (tagptr - bp_size) & ~0xff;
@ -266,6 +274,21 @@ static void lx_init(const LxBoardDesc *board, MachineState *machine)
cur_tagptr = put_tag(cur_tagptr, BP_TAG_COMMAND_LINE,
strlen(kernel_cmdline) + 1, kernel_cmdline);
}
if (dtb_filename) {
int fdt_size;
void *fdt = load_device_tree(dtb_filename, &fdt_size);
uint32_t dtb_addr = tswap32(cur_lowmem);
if (!fdt) {
error_report("could not load DTB '%s'\n", dtb_filename);
exit(EXIT_FAILURE);
}
cpu_physical_memory_write(cur_lowmem, fdt, fdt_size);
cur_tagptr = put_tag(cur_tagptr, BP_TAG_FDT,
sizeof(dtb_addr), &dtb_addr);
cur_lowmem = QEMU_ALIGN_UP(cur_lowmem + fdt_size, 4096);
}
cur_tagptr = put_tag(cur_tagptr, BP_TAG_LAST, 0, NULL);
env->regs[2] = tagptr;