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Fri, 14 Feb 2020 12:26:00 +0000 (GMT) Subject: Re: [PATCH] ARM: bcm2835_defconfig: add minimal support for Raspberry Pi4 To: Stefan Wahren , Nicolas Saenz Julienne , linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org From: Marek Szyprowski Message-ID: <8bd7a25a-359d-5b30-4c95-004032d78cb6@samsung.com> Date: Fri, 14 Feb 2020 13:25:59 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <916c0113-9910-26cd-3720-15399fde507b@i2se.com> Content-Transfer-Encoding: 7bit Content-Language: en-US X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprBKsWRmVeSWpSXmKPExsWy7djP87o3J7rFGex8omix6fE1VovLu+aw WUy8vYHdYtus5WwWm1bcYHNg9dh6y9Rj85J6j82nqz0+b5ILYInisklJzcksSy3St0vgyrh3 /D1LwQ2uigPzaxsYT3F0MXJySAiYSLzu+c/axcjFISSwglGi5cp9JgjnC6PE7f9LoTKfGSWW 9Lezw7T8enuRBSKxnFHixKR3zBDOW0aJnfMXgVUJC4RIbOmcA5YQETjJKNFx8S0LSIJNwFCi 620XG4jNK2AncWT6VbA4i4CqxNQt7WBxUYFYidkrD7NA1AhKnJz5BMjm4OAUsJFYcM4PJMws IC+x/S3IfBBbXOLWk/lgd0sIdLNLvL81nx2kXkLARWLeyjKIq4UlXh3fAvWBjMTpyT0sEPXN jBIPz61lh3B6GCUuN81ghKiylrhz7hcbyCBmAU2J9bv0IcKOEk+3bYKazydx460gxA18EpO2 TWeGCPNKdLQJQVSrScw6vg5u7cELl5ghbA+JpVdmMU5gVJyF5MlZSD6bheSzWQg3LGBkWcUo nlpanJueWmycl1quV5yYW1yal66XnJ+7iRGYXk7/O/51B+O+P0mHGAU4GJV4eCX63OKEWBPL iitzDzFKcDArifAeVgQK8aYkVlalFuXHF5XmpBYfYpTmYFES5zVe9DJWSCA9sSQ1OzW1ILUI JsvEwSnVwLjWvXuN1IXqk+F37BTdVRdkVCz9e0PQsmLuqc28UT38BV3BYlksK0vTPu3azHF/ +eT/E4+/0gsrZ/VPjv21+5FrfG32dU9eg9pTrw+u+6k9981yoTcbn2dyvjKJiFtf+2bt7ie+ E77vz/dacnbtEvnSbJtrCV8vfE8u5nTt9Ljg/0984jK7ltNKLMUZiYZazEXFiQA7Kk9rKwMA AA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprPIsWRmVeSWpSXmKPExsVy+t/xu7o3J7rFGVz7yGOx6fE1VovLu+aw WUy8vYHdYtus5WwWm1bcYHNg9dh6y9Rj85J6j82nqz0+b5ILYInSsynKLy1JVcjILy6xVYo2 tDDSM7S00DMysdQzNDaPtTIyVdK3s0lJzcksSy3St0vQy7h3/D1LwQ2uigPzaxsYT3F0MXJy SAiYSPx6e5Gli5GLQ0hgKaPEnX9zmCASMhInpzWwQtjCEn+udbFBFL1mlNg/4SYzSEJYIETi Se8ydpCEiMBpRom2R9OgRm1mknjydDIjSBWbgKFE11uQdk4OXgE7iSPTr7KA2CwCqhJTt7SD xUUFYiVuzOxggqgRlDg58wlQDQcHp4CNxIJzfiBhZgEziXmbHzJD2PIS29/OgbLFJW49mc80 gVFwFpLuWUhaZiFpmYWkZQEjyypGkdTS4tz03GJDveLE3OLSvHS95PzcTYzAyNl27OfmHYyX NgYfYhTgYFTi4S2Y4BYnxJpYVlyZe4hRgoNZSYT3sCJQiDclsbIqtSg/vqg0J7X4EKMp0G8T maVEk/OBUZ1XEm9oamhuYWlobmxubGahJM7bIXAwRkggPbEkNTs1tSC1CKaPiYNTqoFx0b05 /iePvQrZ6cs07dVE7uOOkRHRe9VehFwwlnjA/XC5aHxMdINszdXEXws5bHT6Tt+zcOyddr/p UHfjOvXN/y4VXAzf8N77ybRbkzc5JqUzLpmS1vF/f9xR9aRFbsJF8lGWW+2EGfjbxIz4zzkk b2Pz+/w6yeqHweLv3WKOJ6sOB/5K31GhxFKckWioxVxUnAgAmSraYrICAAA= X-CMS-MailID: 20200214122601eucas1p1d1b141c41c788821c80ae6bc2ce04f8a X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20200212102022eucas1p1c49daf15d3e63eda9a56124bc4eafb57 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200212102022eucas1p1c49daf15d3e63eda9a56124bc4eafb57 References: <20200212102009.17428-1-m.szyprowski@samsung.com> <5adcb2de-3570-9c4d-5e5b-726b94fb2029@samsung.com> <916c0113-9910-26cd-3720-15399fde507b@i2se.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Stefan, On 13.02.2020 10:59, Stefan Wahren wrote: > On 13.02.20 08:35, Marek Szyprowski wrote: >> On 12.02.2020 19:31, Nicolas Saenz Julienne wrote: >>> On Wed, 2020-02-12 at 11:20 +0100, Marek Szyprowski wrote: >>>> Add drivers for the minimal set of devices needed to boot Raspberry Pi4 >>>> board. >>>> >>>> Signed-off-by: Marek Szyprowski >>> Just so you know, the amount of support on the RPi4 you might be able to get >>> updating bcm2835_defconfig's config is very limited. Only 1GB of ram and no >>> PCIe (so no USBs). >> Yes, I know. A lots of core features is missing: SMP, HIGHMEM, LPAE, PCI >> and so on, but having a possibility to boot RPi4 with this defconfig >> increases the test coverage. > in case you want to increase test coverage, we better enable all > Raspberry Pi 4 relevant hardware parts (hwrng, thermal, PCI ...). This > is what we did for older Pi boards. Okay, I will add thermal in v2. HWRNG is already selected as module. Enabling PCI without LPAE makes no sense as the driver won't be able to initialize properly. > SMP, HIGHMEM, LPAE are different and shouldn't be enabled in > bcm2835_defconfig from my PoV. Maybe it would make sense to also add bcm2711_defconfig or bcm2835_lpae_defconfig? Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland