Re: building brcmfmac driver for iMX6 Ultralite platform

[Arend Van Spriel <arend.vanspriel@broadcom.com>]

On 30-6-2016 21:24, Michael Eskowitz wrote:
> I am trying to bring up the brcmfmac driver on an iMX6 Ultralite board.  I
> have both a 43341 and 43362 Wi-Fi SDIO module up and running on this
> platform already using the standard bcmdhd.  I am told by some Broadcom
> folks that the brcmfmac driver should support concurrent connections which
> is something the bcmdhd does not do and that is my primary motivation for
> getting the fmac driver up and running.

bcmdhd is the standard *android* driver as provided in AOSP. So do you
intend to productize your platform with android. The brcmfmac is our
upstream driver so it will not have android specific functionality.

> The brcmfmac driver is included in NXP's kernel git and I have successfully
> built it and have it on the Ultralite platform running kernel 3.14.38.  When
> I attempt to insert the module using the command
> 
> 	insmod  brcmfmac.ko
> firmware_path=ISM4334X_Wifi_FW_6.10.190.49_P.bin
> nvram_path=ISM4334X_NVRAM_C1.txt
> 
> I receive the following errors:
> 
> 	brcmfmac: Unknown symbol brcmu_pktq_mlen (err 0)
> 	brcmfmac: Unknown symbol brcmu_pkt_buf_free_skb (err 0)
> 	brcmfmac: Unknown symbol brcmu_pktq_init (err 0)
> 	brcmfmac: Unknown symbol brcmu_pktq_penq_head (err 0)
> 	brcmfmac: Unknown symbol brcmu_pktq_pdeq (err 0)
> 	brcmfmac: Unknown symbol brcmu_pktq_peek_tail (err 0)
> 	brcmfmac: Unknown symbol brcmu_pktq_flush (err 0)
> 	brcmfmac: Unknown symbol brcmu_pktq_pdeq_match (err 0)
> 	brcmfmac: Unknown symbol brcmu_pktq_mdeq (err 0)
> 	brcmfmac: Unknown symbol brcmu_pktq_penq (err 0)
> 	brcmfmac: Unknown symbol brcmu_pktq_pdeq_tail (err 0)
> 	brcmfmac: Unknown symbol brcmu_pkt_buf_get_skb (err 0)
> 	brcmfmac: Unknown symbol brcmu_d11_attach (err 0)
> 	insmod: ERROR: could not insert module brcmfmac.ko: Unknown symbol
> in module
> 
> I'm not sure that the firmware_path and nvram_path should be specified in
> this manner, but I doubt that is what is causing these errors.  

The brcmfmac driver does not have module parameters firmware_path and
nvram_path. The filenaming is determined by the driver and it must be in
a location that firmware api provider looks for:

drivers/base/firmware_class.c:277:
/* direct firmware loading support */
static char fw_path_para[256];
static const char * const fw_path[] = {
        fw_path_para,
        "/lib/firmware/updates/" UTS_RELEASE,
        "/lib/firmware/updates",
        "/lib/firmware/" UTS_RELEASE,
        "/lib/firmware"
};

/*
 * Typical usage is that passing 'firmware_class.path=$CUSTOMIZED_PATH'
 * from kernel command line because firmware_class is generally built in
 * kernel instead of module.
 */
module_param_string(path, fw_path_para, sizeof(fw_path_para), 0644);
MODULE_PARM_DESC(path, "customized firmware image search path with a
higher priority than default path");

However, this is indeed not the reason for the errors. The brcmfmac
needs functions exported by brcmutil.ko which should be created in the
build you executed.

Regards,
Arend

> The module compiled and built just fine so I am assuming that there are some
> dependencies that aren't being met.  Is there another module that I need to
> load before attempting to load the fmac driver?
> 
> Thanks,
> -Mike