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qemu-patch-raspberry4/hw/ppc.c
j_mayer e9df014c0b Implement embedded IRQ controller for PowerPC 6xx/740 & 750. 
Fix PowerPC external interrupt input handling and lowering.
Fix OpenPIC output pins management.
Fix multiples bugs in OpenPIC IRQ management.
Fix OpenPIC CPU(s) reset function.
Fix Mac99 machine to properly route OpenPIC outputs to the PowerPC input pins.
Fix PREP machine to properly route i8259 output to the PowerPC external
  interrupt pin.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2647 c046a42c-6fe2-441c-8c8c-71466251a162
2007-04-09 22:45:36 +00:00

728 lines
20 KiB
C
Raw Blame History

/*
* QEMU generic PowerPC hardware System Emulator
*
* Copyright (c) 2003-2007 Jocelyn Mayer
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "vl.h"
#include "m48t59.h"
//#define PPC_DEBUG_IRQ
extern FILE *logfile;
extern int loglevel;
void ppc_set_irq (CPUState *env, int n_IRQ, int level)
{
if (level) {
env->pending_interrupts |= 1 << n_IRQ;
cpu_interrupt(env, CPU_INTERRUPT_HARD);
} else {
env->pending_interrupts &= ~(1 << n_IRQ);
if (env->pending_interrupts == 0)
cpu_reset_interrupt(env, CPU_INTERRUPT_HARD);
}
#if defined(PPC_DEBUG_IRQ)
printf("%s: %p n_IRQ %d level %d => pending %08x req %08x\n", __func__,
env, n_IRQ, level, env->pending_interrupts, env->interrupt_request);
#endif
}
/* PowerPC 6xx / 7xx internal IRQ controller */
static void ppc6xx_set_irq (void *opaque, int pin, int level)
{
CPUState *env = opaque;
int cur_level;
#if defined(PPC_DEBUG_IRQ)
printf("%s: env %p pin %d level %d\n", __func__, env, pin, level);
#endif
cur_level = (env->irq_input_state >> pin) & 1;
/* Don't generate spurious events */
if ((cur_level == 1 && level == 0) || (cur_level == 0 && level != 0) || 0) {
switch (pin) {
case PPC_INPUT_INT:
/* Level sensitive - asserted high */
#if defined(PPC_DEBUG_IRQ)
printf("%s: set the external IRQ state to %d\n", __func__, level);
#endif
ppc_set_irq(env, PPC_INTERRUPT_EXT, level);
break;
case PPC_INPUT_SMI:
/* Level sensitive - active high */
#if defined(PPC_DEBUG_IRQ)
printf("%s: set the SMI IRQ state to %d\n", __func__, level);
#endif
ppc_set_irq(env, PPC_INTERRUPT_SMI, level);
break;
case PPC_INPUT_MCP:
/* Negative edge sensitive */
/* XXX: TODO: actual reaction may depends on HID0 status
* 603/604/740/750: check HID0[EMCP]
*/
if (cur_level == 1 && level == 0) {
#if defined(PPC_DEBUG_IRQ)
printf("%s: raise machine check state\n", __func__);
#endif
ppc_set_irq(env, PPC_INTERRUPT_MCK, 1);
}
break;
case PPC_INPUT_CKSTP_IN:
/* Level sensitive - active low */
/* XXX: TODO: relay the signal to CKSTP_OUT pin */
if (level) {
#if defined(PPC_DEBUG_IRQ)
printf("%s: stop the CPU\n", __func__);
#endif
env->halted = 1;
} else {
#if defined(PPC_DEBUG_IRQ)
printf("%s: restart the CPU\n", __func__);
#endif
env->halted = 0;
}
break;
case PPC_INPUT_HRESET:
/* Level sensitive - active low */
if (level) {
#if 0 // XXX: TOFIX
#if defined(PPC_DEBUG_IRQ)
printf("%s: reset the CPU\n", __func__);
#endif
cpu_reset(env);
#endif
}
break;
case PPC_INPUT_SRESET:
#if defined(PPC_DEBUG_IRQ)
printf("%s: set the RESET IRQ state to %d\n", __func__, level);
#endif
ppc_set_irq(env, PPC_INTERRUPT_RESET, level);
break;
default:
/* Unknown pin - do nothing */
#if defined(PPC_DEBUG_IRQ)
printf("%s: unknown IRQ pin %d\n", __func__, pin);
#endif
return;
}
if (level)
env->irq_input_state |= 1 << pin;
else
env->irq_input_state &= ~(1 << pin);
}
}
void ppc6xx_irq_init (CPUState *env)
{
env->irq_inputs = (void **)qemu_allocate_irqs(&ppc6xx_set_irq, env, 6);
}
/*****************************************************************************/
/* PowerPC time base and decrementer emulation */
//#define DEBUG_TB
struct ppc_tb_t {
/* Time base management */
int64_t tb_offset; /* Compensation */
uint32_t tb_freq; /* TB frequency */
/* Decrementer management */
uint64_t decr_next; /* Tick for next decr interrupt */
struct QEMUTimer *decr_timer;
void *opaque;
};
static inline uint64_t cpu_ppc_get_tb (ppc_tb_t *tb_env)
{
/* TB time in tb periods */
return muldiv64(qemu_get_clock(vm_clock) + tb_env->tb_offset,
tb_env->tb_freq, ticks_per_sec);
}
uint32_t cpu_ppc_load_tbl (CPUState *env)
{
ppc_tb_t *tb_env = env->tb_env;
uint64_t tb;
tb = cpu_ppc_get_tb(tb_env);
#ifdef DEBUG_TB
{
static int last_time;
int now;
now = time(NULL);
if (last_time != now) {
last_time = now;
printf("%s: tb=0x%016lx %d %08lx\n",
__func__, tb, now, tb_env->tb_offset);
}
}
#endif
return tb & 0xFFFFFFFF;
}
uint32_t cpu_ppc_load_tbu (CPUState *env)
{
ppc_tb_t *tb_env = env->tb_env;
uint64_t tb;
tb = cpu_ppc_get_tb(tb_env);
#ifdef DEBUG_TB
printf("%s: tb=0x%016lx\n", __func__, tb);
#endif
return tb >> 32;
}
static void cpu_ppc_store_tb (ppc_tb_t *tb_env, uint64_t value)
{
tb_env->tb_offset = muldiv64(value, ticks_per_sec, tb_env->tb_freq)
- qemu_get_clock(vm_clock);
#ifdef DEBUG_TB
printf("%s: tb=0x%016lx offset=%08x\n", __func__, value);
#endif
}
void cpu_ppc_store_tbu (CPUState *env, uint32_t value)
{
ppc_tb_t *tb_env = env->tb_env;
cpu_ppc_store_tb(tb_env,
((uint64_t)value << 32) | cpu_ppc_load_tbl(env));
}
void cpu_ppc_store_tbl (CPUState *env, uint32_t value)
{
ppc_tb_t *tb_env = env->tb_env;
cpu_ppc_store_tb(tb_env,
((uint64_t)cpu_ppc_load_tbu(env) << 32) | value);
}
uint32_t cpu_ppc_load_decr (CPUState *env)
{
ppc_tb_t *tb_env = env->tb_env;
uint32_t decr;
int64_t diff;
diff = tb_env->decr_next - qemu_get_clock(vm_clock);
if (diff >= 0)
decr = muldiv64(diff, tb_env->tb_freq, ticks_per_sec);
else
decr = -muldiv64(-diff, tb_env->tb_freq, ticks_per_sec);
#if defined(DEBUG_TB)
printf("%s: 0x%08x\n", __func__, decr);
#endif
return decr;
}
/* When decrementer expires,
* all we need to do is generate or queue a CPU exception
*/
static inline void cpu_ppc_decr_excp (CPUState *env)
{
/* Raise it */
#ifdef DEBUG_TB
printf("raise decrementer exception\n");
#endif
ppc_set_irq(env, PPC_INTERRUPT_DECR, 1);
}
static void _cpu_ppc_store_decr (CPUState *env, uint32_t decr,
uint32_t value, int is_excp)
{
ppc_tb_t *tb_env = env->tb_env;
uint64_t now, next;
#ifdef DEBUG_TB
printf("%s: 0x%08x => 0x%08x\n", __func__, decr, value);
#endif
now = qemu_get_clock(vm_clock);
next = now + muldiv64(value, ticks_per_sec, tb_env->tb_freq);
if (is_excp)
next += tb_env->decr_next - now;
if (next == now)
next++;
tb_env->decr_next = next;
/* Adjust timer */
qemu_mod_timer(tb_env->decr_timer, next);
/* If we set a negative value and the decrementer was positive,
* raise an exception.
*/
if ((value & 0x80000000) && !(decr & 0x80000000))
cpu_ppc_decr_excp(env);
}
void cpu_ppc_store_decr (CPUState *env, uint32_t value)
{
_cpu_ppc_store_decr(env, cpu_ppc_load_decr(env), value, 0);
}
static void cpu_ppc_decr_cb (void *opaque)
{
_cpu_ppc_store_decr(opaque, 0x00000000, 0xFFFFFFFF, 1);
}
/* Set up (once) timebase frequency (in Hz) */
ppc_tb_t *cpu_ppc_tb_init (CPUState *env, uint32_t freq)
{
ppc_tb_t *tb_env;
tb_env = qemu_mallocz(sizeof(ppc_tb_t));
if (tb_env == NULL)
return NULL;
env->tb_env = tb_env;
if (tb_env->tb_freq == 0 || 1) {
tb_env->tb_freq = freq;
/* Create new timer */
tb_env->decr_timer =
qemu_new_timer(vm_clock, &cpu_ppc_decr_cb, env);
/* There is a bug in Linux 2.4 kernels:
* if a decrementer exception is pending when it enables msr_ee,
* it's not ready to handle it...
*/
_cpu_ppc_store_decr(env, 0xFFFFFFFF, 0xFFFFFFFF, 0);
}
return tb_env;
}
/* Specific helpers for POWER & PowerPC 601 RTC */
ppc_tb_t *cpu_ppc601_rtc_init (CPUState *env)
{
return cpu_ppc_tb_init(env, 7812500);
}
void cpu_ppc601_store_rtcu (CPUState *env, uint32_t value)
__attribute__ (( alias ("cpu_ppc_store_tbu") ));
uint32_t cpu_ppc601_load_rtcu (CPUState *env)
__attribute__ (( alias ("cpu_ppc_load_tbu") ));
void cpu_ppc601_store_rtcl (CPUState *env, uint32_t value)
{
cpu_ppc_store_tbl(env, value & 0x3FFFFF80);
}
uint32_t cpu_ppc601_load_rtcl (CPUState *env)
{
return cpu_ppc_load_tbl(env) & 0x3FFFFF80;
}
/*****************************************************************************/
/* Embedded PowerPC timers */
/* PIT, FIT & WDT */
typedef struct ppcemb_timer_t ppcemb_timer_t;
struct ppcemb_timer_t {
uint64_t pit_reload; /* PIT auto-reload value */
uint64_t fit_next; /* Tick for next FIT interrupt */
struct QEMUTimer *fit_timer;
uint64_t wdt_next; /* Tick for next WDT interrupt */
struct QEMUTimer *wdt_timer;
};
/* Fixed interval timer */
static void cpu_4xx_fit_cb (void *opaque)
{
CPUState *env;
ppc_tb_t *tb_env;
ppcemb_timer_t *ppcemb_timer;
uint64_t now, next;
env = opaque;
tb_env = env->tb_env;
ppcemb_timer = tb_env->opaque;
now = qemu_get_clock(vm_clock);
switch ((env->spr[SPR_40x_TCR] >> 24) & 0x3) {
case 0:
next = 1 << 9;
break;
case 1:
next = 1 << 13;
break;
case 2:
next = 1 << 17;
break;
case 3:
next = 1 << 21;
break;
default:
/* Cannot occur, but makes gcc happy */
return;
}
next = now + muldiv64(next, ticks_per_sec, tb_env->tb_freq);
if (next == now)
next++;
qemu_mod_timer(ppcemb_timer->fit_timer, next);
tb_env->decr_next = next;
env->spr[SPR_40x_TSR] |= 1 << 26;
if ((env->spr[SPR_40x_TCR] >> 23) & 0x1)
ppc_set_irq(env, PPC_INTERRUPT_FIT, 1);
if (loglevel) {
fprintf(logfile, "%s: ir %d TCR %08x TSR %08x\n", __func__,
(env->spr[SPR_40x_TCR] >> 23) & 0x1,
env->spr[SPR_40x_TCR], env->spr[SPR_40x_TSR]);
}
}
/* Programmable interval timer */
static void cpu_4xx_pit_cb (void *opaque)
{
CPUState *env;
ppc_tb_t *tb_env;
ppcemb_timer_t *ppcemb_timer;
uint64_t now, next;
env = opaque;
tb_env = env->tb_env;
ppcemb_timer = tb_env->opaque;
now = qemu_get_clock(vm_clock);
if ((env->spr[SPR_40x_TCR] >> 22) & 0x1) {
/* Auto reload */
next = now + muldiv64(ppcemb_timer->pit_reload,
ticks_per_sec, tb_env->tb_freq);
if (next == now)
next++;
qemu_mod_timer(tb_env->decr_timer, next);
tb_env->decr_next = next;
}
env->spr[SPR_40x_TSR] |= 1 << 27;
if ((env->spr[SPR_40x_TCR] >> 26) & 0x1)
ppc_set_irq(env, PPC_INTERRUPT_PIT, 1);
if (loglevel) {
fprintf(logfile, "%s: ar %d ir %d TCR %08x TSR %08x %08lx\n", __func__,
(env->spr[SPR_40x_TCR] >> 22) & 0x1,
(env->spr[SPR_40x_TCR] >> 26) & 0x1,
env->spr[SPR_40x_TCR], env->spr[SPR_40x_TSR],
ppcemb_timer->pit_reload);
}
}
/* Watchdog timer */
static void cpu_4xx_wdt_cb (void *opaque)
{
CPUState *env;
ppc_tb_t *tb_env;
ppcemb_timer_t *ppcemb_timer;
uint64_t now, next;
env = opaque;
tb_env = env->tb_env;
ppcemb_timer = tb_env->opaque;
now = qemu_get_clock(vm_clock);
switch ((env->spr[SPR_40x_TCR] >> 30) & 0x3) {
case 0:
next = 1 << 17;
break;
case 1:
next = 1 << 21;
break;
case 2:
next = 1 << 25;
break;
case 3:
next = 1 << 29;
break;
default:
/* Cannot occur, but makes gcc happy */
return;
}
next = now + muldiv64(next, ticks_per_sec, tb_env->tb_freq);
if (next == now)
next++;
if (loglevel) {
fprintf(logfile, "%s: TCR %08x TSR %08x\n", __func__,
env->spr[SPR_40x_TCR], env->spr[SPR_40x_TSR]);
}
switch ((env->spr[SPR_40x_TSR] >> 30) & 0x3) {
case 0x0:
case 0x1:
qemu_mod_timer(ppcemb_timer->wdt_timer, next);
ppcemb_timer->wdt_next = next;
env->spr[SPR_40x_TSR] |= 1 << 31;
break;
case 0x2:
qemu_mod_timer(ppcemb_timer->wdt_timer, next);
ppcemb_timer->wdt_next = next;
env->spr[SPR_40x_TSR] |= 1 << 30;
if ((env->spr[SPR_40x_TCR] >> 27) & 0x1)
ppc_set_irq(env, PPC_INTERRUPT_WDT, 1);
break;
case 0x3:
env->spr[SPR_40x_TSR] &= ~0x30000000;
env->spr[SPR_40x_TSR] |= env->spr[SPR_40x_TCR] & 0x30000000;
switch ((env->spr[SPR_40x_TCR] >> 28) & 0x3) {
case 0x0:
/* No reset */
break;
case 0x1: /* Core reset */
case 0x2: /* Chip reset */
case 0x3: /* System reset */
qemu_system_reset_request();
return;
}
}
}
void store_40x_pit (CPUState *env, target_ulong val)
{
ppc_tb_t *tb_env;
ppcemb_timer_t *ppcemb_timer;
uint64_t now, next;
tb_env = env->tb_env;
ppcemb_timer = tb_env->opaque;
if (loglevel)
fprintf(logfile, "%s %p %p\n", __func__, tb_env, ppcemb_timer);
ppcemb_timer->pit_reload = val;
if (val == 0) {
/* Stop PIT */
if (loglevel)
fprintf(logfile, "%s: stop PIT\n", __func__);
qemu_del_timer(tb_env->decr_timer);
} else {
if (loglevel)
fprintf(logfile, "%s: start PIT 0x%08x\n", __func__, val);
now = qemu_get_clock(vm_clock);
next = now + muldiv64(val, ticks_per_sec, tb_env->tb_freq);
if (next == now)
next++;
qemu_mod_timer(tb_env->decr_timer, next);
tb_env->decr_next = next;
}
}
target_ulong load_40x_pit (CPUState *env)
{
return cpu_ppc_load_decr(env);
}
void store_booke_tsr (CPUState *env, target_ulong val)
{
env->spr[SPR_40x_TSR] = val & 0xFC000000;
}
void store_booke_tcr (CPUState *env, target_ulong val)
{
/* We don't update timers now. Maybe we should... */
env->spr[SPR_40x_TCR] = val & 0xFF800000;
}
void ppc_emb_timers_init (CPUState *env)
{
ppc_tb_t *tb_env;
ppcemb_timer_t *ppcemb_timer;
tb_env = env->tb_env;
ppcemb_timer = qemu_mallocz(sizeof(ppcemb_timer_t));
tb_env->opaque = ppcemb_timer;
if (loglevel)
fprintf(logfile, "%s %p %p\n", __func__, tb_env, ppcemb_timer);
if (ppcemb_timer != NULL) {
/* We use decr timer for PIT */
tb_env->decr_timer = qemu_new_timer(vm_clock, &cpu_4xx_pit_cb, env);
ppcemb_timer->fit_timer =
qemu_new_timer(vm_clock, &cpu_4xx_fit_cb, env);
ppcemb_timer->wdt_timer =
qemu_new_timer(vm_clock, &cpu_4xx_wdt_cb, env);
}
}
#if 0
/*****************************************************************************/
/* Handle system reset (for now, just stop emulation) */
void cpu_ppc_reset (CPUState *env)
{
printf("Reset asked... Stop emulation\n");
abort();
}
#endif
/*****************************************************************************/
/* Debug port */
void PPC_debug_write (void *opaque, uint32_t addr, uint32_t val)
{
addr &= 0xF;
switch (addr) {
case 0:
printf("%c", val);
break;
case 1:
printf("\n");
fflush(stdout);
break;
case 2:
printf("Set loglevel to %04x\n", val);
cpu_set_log(val | 0x100);
break;
}
}
/*****************************************************************************/
/* NVRAM helpers */
void NVRAM_set_byte (m48t59_t *nvram, uint32_t addr, uint8_t value)
{
m48t59_write(nvram, addr, value);
}
uint8_t NVRAM_get_byte (m48t59_t *nvram, uint32_t addr)
{
return m48t59_read(nvram, addr);
}
void NVRAM_set_word (m48t59_t *nvram, uint32_t addr, uint16_t value)
{
m48t59_write(nvram, addr, value >> 8);
m48t59_write(nvram, addr + 1, value & 0xFF);
}
uint16_t NVRAM_get_word (m48t59_t *nvram, uint32_t addr)
{
uint16_t tmp;
tmp = m48t59_read(nvram, addr) << 8;
tmp |= m48t59_read(nvram, addr + 1);
return tmp;
}
void NVRAM_set_lword (m48t59_t *nvram, uint32_t addr, uint32_t value)
{
m48t59_write(nvram, addr, value >> 24);
m48t59_write(nvram, addr + 1, (value >> 16) & 0xFF);
m48t59_write(nvram, addr + 2, (value >> 8) & 0xFF);
m48t59_write(nvram, addr + 3, value & 0xFF);
}
uint32_t NVRAM_get_lword (m48t59_t *nvram, uint32_t addr)
{
uint32_t tmp;
tmp = m48t59_read(nvram, addr) << 24;
tmp |= m48t59_read(nvram, addr + 1) << 16;
tmp |= m48t59_read(nvram, addr + 2) << 8;
tmp |= m48t59_read(nvram, addr + 3);
return tmp;
}
void NVRAM_set_string (m48t59_t *nvram, uint32_t addr,
const unsigned char *str, uint32_t max)
{
int i;
for (i = 0; i < max && str[i] != '\0'; i++) {
m48t59_write(nvram, addr + i, str[i]);
}
m48t59_write(nvram, addr + max - 1, '\0');
}
int NVRAM_get_string (m48t59_t *nvram, uint8_t *dst, uint16_t addr, int max)
{
int i;
memset(dst, 0, max);
for (i = 0; i < max; i++) {
dst[i] = NVRAM_get_byte(nvram, addr + i);
if (dst[i] == '\0')
break;
}
return i;
}
static uint16_t NVRAM_crc_update (uint16_t prev, uint16_t value)
{
uint16_t tmp;
uint16_t pd, pd1, pd2;
tmp = prev >> 8;
pd = prev ^ value;
pd1 = pd & 0x000F;
pd2 = ((pd >> 4) & 0x000F) ^ pd1;
tmp ^= (pd1 << 3) | (pd1 << 8);
tmp ^= pd2 | (pd2 << 7) | (pd2 << 12);
return tmp;
}
uint16_t NVRAM_compute_crc (m48t59_t *nvram, uint32_t start, uint32_t count)
{
uint32_t i;
uint16_t crc = 0xFFFF;
int odd;
odd = count & 1;
count &= ~1;
for (i = 0; i != count; i++) {
crc = NVRAM_crc_update(crc, NVRAM_get_word(nvram, start + i));
}
if (odd) {
crc = NVRAM_crc_update(crc, NVRAM_get_byte(nvram, start + i) << 8);
}
return crc;
}
#define CMDLINE_ADDR 0x017ff000
int PPC_NVRAM_set_params (m48t59_t *nvram, uint16_t NVRAM_size,
const unsigned char *arch,
uint32_t RAM_size, int boot_device,
uint32_t kernel_image, uint32_t kernel_size,
const char *cmdline,
uint32_t initrd_image, uint32_t initrd_size,
uint32_t NVRAM_image,
int width, int height, int depth)
{
uint16_t crc;
/* Set parameters for Open Hack'Ware BIOS */
NVRAM_set_string(nvram, 0x00, "QEMU_BIOS", 16);
NVRAM_set_lword(nvram, 0x10, 0x00000002); /* structure v2 */
NVRAM_set_word(nvram, 0x14, NVRAM_size);
NVRAM_set_string(nvram, 0x20, arch, 16);
NVRAM_set_lword(nvram, 0x30, RAM_size);
NVRAM_set_byte(nvram, 0x34, boot_device);
NVRAM_set_lword(nvram, 0x38, kernel_image);
NVRAM_set_lword(nvram, 0x3C, kernel_size);
if (cmdline) {
/* XXX: put the cmdline in NVRAM too ? */
strcpy(phys_ram_base + CMDLINE_ADDR, cmdline);
NVRAM_set_lword(nvram, 0x40, CMDLINE_ADDR);
NVRAM_set_lword(nvram, 0x44, strlen(cmdline));
} else {
NVRAM_set_lword(nvram, 0x40, 0);
NVRAM_set_lword(nvram, 0x44, 0);
}
NVRAM_set_lword(nvram, 0x48, initrd_image);
NVRAM_set_lword(nvram, 0x4C, initrd_size);
NVRAM_set_lword(nvram, 0x50, NVRAM_image);
NVRAM_set_word(nvram, 0x54, width);
NVRAM_set_word(nvram, 0x56, height);
NVRAM_set_word(nvram, 0x58, depth);
crc = NVRAM_compute_crc(nvram, 0x00, 0xF8);
NVRAM_set_word(nvram, 0xFC, crc);
return 0;
}
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