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aspeed: Introduce a "bmc-console" machine option

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Most of the Aspeed machines use the UART5 device for the boot console,
and QEMU connects the first serial Chardev to this SoC device for this
purpose. See routine connect_serial_hds_to_uarts().

Nevertheless, some machines use another boot console, such as the fuji,
and commit 5d63d0c76c ("hw/arm/aspeed: Allow machine to set UART
default") introduced a SoC class attribute 'uart_default' and property
to be able to change the boot console device. It was later changed by
commit d2b3eaefb4 ("aspeed: Refactor UART init for multi-SoC machines").

The "bmc-console" machine option goes a step further and lets the user define
the UART device from the QEMU command line without introducing a new
machine definition. For instance, to use device UART3 (mapped on
/dev/ttyS2 under Linux) instead of the default UART5, one would use :

  -M ast2500-evb,bmc-console=uart3

Cc: Abhishek Singh Dagur <abhishek@drut.io>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
This commit is contained in:
Cédric Le Goater 2023-06-07 06:39:42 +02:00
parent ebd643ebd2
commit f65f6ad5a7
2 changed files with 49 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
docs/system/arm/aspeed.rst
View File

@ -122,6 +122,11 @@ Options specific to Aspeed machines are :
* ``spi-model`` to change the SPI Flash model.
* ``bmc-console`` to change the default console device. Most of the
machines use the ``UART5`` device for a boot console, which is
mapped on ``/dev/ttyS4`` under Linux, but it is not always the
case.
For instance, to start the ``ast2500-evb`` machine with a different
FMC chip and a bigger (64M) SPI chip, use :
@ -129,6 +134,12 @@ FMC chip and a bigger (64M) SPI chip, use :
-M ast2500-evb,fmc-model=mx25l25635e,spi-model=mx66u51235f
To change the boot console and use device ``UART3`` (``/dev/ttyS2``
under Linux), use :
.. code-block:: bash
-M ast2500-evb,bmc-console=uart3
Aspeed minibmc family boards (``ast1030-evb``)
==================================================================

40
hw/arm/aspeed.c
View File

@ -42,6 +42,7 @@ struct AspeedMachineState {
AspeedSoCState soc;
MemoryRegion boot_rom;
bool mmio_exec;
uint32_t uart_chosen;
char *fmc_model;
char *spi_model;
};
@ -333,10 +334,11 @@ static void connect_serial_hds_to_uarts(AspeedMachineState *bmc)
AspeedMachineClass *amc = ASPEED_MACHINE_GET_CLASS(bmc);
AspeedSoCState *s = &bmc->soc;
AspeedSoCClass *sc = ASPEED_SOC_GET_CLASS(s);
int uart_chosen = bmc->uart_chosen ? bmc->uart_chosen : amc->uart_default;
aspeed_soc_uart_set_chr(s, amc->uart_default, serial_hd(0));
aspeed_soc_uart_set_chr(s, uart_chosen, serial_hd(0));
for (int i = 1, uart = ASPEED_DEV_UART1; i < sc->uarts_num; i++, uart++) {
if (uart == amc->uart_default) {
if (uart == uart_chosen) {
continue;
}
aspeed_soc_uart_set_chr(s, uart, serial_hd(i));
@ -1078,6 +1080,35 @@ static void aspeed_set_spi_model(Object *obj, const char *value, Error **errp)
bmc->spi_model = g_strdup(value);
}
static char *aspeed_get_bmc_console(Object *obj, Error **errp)
{
AspeedMachineState *bmc = ASPEED_MACHINE(obj);
AspeedMachineClass *amc = ASPEED_MACHINE_GET_CLASS(bmc);
int uart_chosen = bmc->uart_chosen ? bmc->uart_chosen : amc->uart_default;
return g_strdup_printf("uart%d", uart_chosen - ASPEED_DEV_UART1 + 1);
}
static void aspeed_set_bmc_console(Object *obj, const char *value, Error **errp)
{
AspeedMachineState *bmc = ASPEED_MACHINE(obj);
AspeedMachineClass *amc = ASPEED_MACHINE_GET_CLASS(bmc);
AspeedSoCClass *sc = ASPEED_SOC_CLASS(object_class_by_name(amc->soc_name));
int val;
if (sscanf(value, "uart%u", &val) != 1) {
error_setg(errp, "Bad value for \"uart\" property");
return;
}
/* The number of UART depends on the SoC */
if (val < 1 || val > sc->uarts_num) {
error_setg(errp, "\"uart\" should be in range [1 - %d]", sc->uarts_num);
return;
}
bmc->uart_chosen = ASPEED_DEV_UART1 + val - 1;
}
static void aspeed_machine_class_props_init(ObjectClass *oc)
{
object_class_property_add_bool(oc, "execute-in-place",
@ -1086,6 +1117,11 @@ static void aspeed_machine_class_props_init(ObjectClass *oc)
object_class_property_set_description(oc, "execute-in-place",
"boot directly from CE0 flash device");
object_class_property_add_str(oc, "bmc-console", aspeed_get_bmc_console,
aspeed_set_bmc_console);
object_class_property_set_description(oc, "bmc-console",
"Change the default UART to \"uartX\"");
object_class_property_add_str(oc, "fmc-model", aspeed_get_fmc_model,
aspeed_set_fmc_model);
object_class_property_set_description(oc, "fmc-model",