Re: [Qemu-arm] aspeed qemu question

[Cédric Le Goater]

On 5/23/19 12:05 PM, Wim Vervoorn wrote:
> Hello Cédric,
> 
> I have another question regarding the ASPEED Qemu support. This is regarding 
> the SPI support.
> 
> I noticed that in general the fmc_model and the spi_model for the flash device
> are different even though there is only one flash device connected.

The flash devices are created but not attached to a file backend 
unless you define it on the command line with -drive options :

        -drive file=$flashfile,format=raw,if=mtd

The first mtd drive corresponds to the flash chip attached to the 
FMC controller (BMC Firmware), the second is the flash attached to 
the SPI1 controller (Host Firmware)

> I would expect that in this case the models used would be identical.

The flash device models are defined at the machine level in
hw/arm/aspeed.c:

    }, {
        .name      = MACHINE_TYPE_NAME("witherspoon-bmc"),
        .desc      = "OpenPOWER Witherspoon BMC (ARM1176)",
        .soc_name  = "ast2500-a1",
        .hw_strap1 = WITHERSPOON_BMC_HW_STRAP1,
        .fmc_model = "mx25l25635e",
        .spi_model = "mx66l1g45g",
        .num_cs    = 2,
        .i2c_init  = witherspoon_bmc_i2c_init,
        .ram       = 512 * MiB,
    },

> Can you explain how this is works and how I select the correct model
> for the fmc and for the spi controller.

You need to define a new machine (board) if you want different flash models.

C.