[FS#3386] Regression: Broadcom Roboswitch B53

[OpenWrt Bugs]

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FS#3386 - Regression: Broadcom Roboswitch B53
User who did this - Leonardo (humaita)

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Hi,

continuing my research, here are the main differences between Kernel 4.9 and Kernel 4.14 (up to today), also prior to the commit mentioned above.

Adding some debugging variables, I found out that relating to the following dmesg output:


libphy: Fixed MDIO Bus: probed
bgmac_bcma bcma0:2: Found PHY addr: 30 (NOREGS)


In this part, both kernels call "b53_switch_detect" in b53_common.c. Both kernels detect the right switch, i.e. "dev->chip_id = BCM5325_DEVICE_ID;" 


libphy: bcma_mdio mii bus: probed
bgmac_bcma bcma0:2: Support for Roboswitch not implemented


In this part, both kernels call "b53_switch_detect" in b53_common.c again. Kernel 4.9 finds the right switch, i.e. "dev->chip_id = BCM5325_DEVICE_ID;". Kernel 4.14 however doesnt go into "case 0:", and thus can't find the correct switch.
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3386#comment8920

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