From: Sascha Hauer <s.hauer@pengutronix.de>
To: Juergen Beisert <jbe@pengutronix.de>
Cc: barebox@lists.infradead.org, Juergen Beisert <juergen@kreuzholzen.de>
Subject: Re: [PATCH 08/12] Add a video driver for S3C2440 bases platforms
Date: Mon, 1 Nov 2010 15:41:42 +0100 [thread overview]
Message-ID: <20101101144142.GA6017@pengutronix.de> (raw)
In-Reply-To: <1288092708-5187-9-git-send-email-jbe@pengutronix.de>
On Tue, Oct 26, 2010 at 01:31:44PM +0200, Juergen Beisert wrote:
> From: Juergen Beisert <juergen@kreuzholzen.de>
>
> Signed-off-by: Juergen Beisert <juergen@kreuzholzen.de>
> ---
> arch/arm/mach-s3c24xx/include/mach/fb.h | 40 +++
> drivers/video/Kconfig | 6 +
> drivers/video/Makefile | 1 +
> drivers/video/s3c.c | 452 +++++++++++++++++++++++++++++++
> 4 files changed, 499 insertions(+), 0 deletions(-)
> create mode 100644 arch/arm/mach-s3c24xx/include/mach/fb.h
> create mode 100644 drivers/video/s3c.c
>
> diff --git a/arch/arm/mach-s3c24xx/include/mach/fb.h b/arch/arm/mach-s3c24xx/include/mach/fb.h
> new file mode 100644
> index 0000000..eec6164
> --- /dev/null
> +++ b/arch/arm/mach-s3c24xx/include/mach/fb.h
> @@ -0,0 +1,40 @@
> +/*
> + * Copyright (C) 2010 Juergen Beisert
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of
> + * the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
> + * MA 02111-1307 USA
> + *
> + */
> +
> +#ifndef __MACH_FB_H_
> +# define __MACH_FB_H_
> +
> +#include <fb.h>
> +
> +struct s3c_fb_platform_data {
> +
> + const struct fb_videomode *mode_list;
> + unsigned mode_cnt;
> +
> + int passive_display; /**< enable support for STN or CSTN displays */
> +
> + void *framebuffer; /**< force framebuffer base address */
> + unsigned size; /**< force framebuffer size */
> +
> + /** hook to enable backlight and stuff */
> + void (*enable)(int);
> +};
> +
> +#endif /* __MACH_FB_H_ */
> diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
> index d7f3d01..5a5edd2 100644
> --- a/drivers/video/Kconfig
> +++ b/drivers/video/Kconfig
> @@ -39,4 +39,10 @@ config DRIVER_VIDEO_IMX_IPU
> Add support for the IPU framebuffer device found on
> i.MX31 and i.MX35 CPUs.
>
> +config S3C_VIDEO
> + bool "S3C244x framebuffer driver"
> + depends on ARCH_S3C24xx
> + help
> + Add support for the S3C244x LCD controller.
> +
> endif
> diff --git a/drivers/video/Makefile b/drivers/video/Makefile
> index 179f0c4..4287fc8 100644
> --- a/drivers/video/Makefile
> +++ b/drivers/video/Makefile
> @@ -2,3 +2,4 @@ obj-$(CONFIG_VIDEO) += fb.o
>
> obj-$(CONFIG_DRIVER_VIDEO_IMX) += imx.o
> obj-$(CONFIG_DRIVER_VIDEO_IMX_IPU) += imx-ipu-fb.o
> +obj-$(CONFIG_S3C_VIDEO) += s3c.o
> diff --git a/drivers/video/s3c.c b/drivers/video/s3c.c
> new file mode 100644
> index 0000000..8ae5785
> --- /dev/null
> +++ b/drivers/video/s3c.c
> @@ -0,0 +1,452 @@
> +/*
> + * Copyright (C) 2010 Juergen Beisert
> + *
> + * This driver is based on a patch found in the web:
> + * (C) Copyright 2006 by OpenMoko, Inc.
> + * Author: Harald Welte <laforge at openmoko.org>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of
> + * the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
> + * MA 02111-1307 USA
> + *
> + */
> +
> +/* #define DEBUG */
> +
> +#include <common.h>
> +#include <init.h>
> +#include <fb.h>
> +#include <driver.h>
> +#include <malloc.h>
> +#include <errno.h>
> +#include <asm/io.h>
> +#include <mach/gpio.h>
> +#include <mach/s3c24xx-generic.h>
> +#include <mach/s3c24x0-clocks.h>
> +#include <mach/fb.h>
> +
> +#define LCDCON1 0x00
> +# define PNRMODE(x) (((x) & 3) << 5)
> +# define BPPMODE(x) (((x) & 0xf) << 1)
> +# define SET_CLKVAL(x) (((x) & 0x3ff) << 8)
> +# define GET_CLKVAL(x) (((x) >> 8) & 0x3ff)
> +# define ENVID (1 << 0)
> +
> +#define LCDCON2 0x04
> +# define SET_VBPD(x) (((x) & 0xff) << 24)
> +# define SET_LINEVAL(x) (((x) & 0x3ff) << 14)
> +# define SET_VFPD(x) (((x) & 0xff) << 6)
> +# define SET_VSPW(x) ((x) & 0x3f)
> +
> +#define LCDCON3 0x08
> +# define SET_HBPD(x) (((x) & 0x7f) << 19)
> +# define SET_HOZVAL(x) (((x) & 0x7ff) << 8)
> +# define SET_HFPD(x) ((x) & 0xff)
> +
> +#define LCDCON4 0x0c
> +# define SET_HSPW(x) ((x) & 0xff)
> +
> +#define LCDCON5 0x10
> +# define BPP24BL (1 << 12)
> +# define FRM565 (1 << 11)
> +# define INV_CLK (1 << 10)
> +# define INV_HS (1 << 9)
> +# define INV_VS (1 << 8)
> +# define INV_DTA (1 << 7)
> +# define INV_DE (1 << 6)
> +# define INV_PWREN (1 << 5)
> +# define INV_LEND (1 << 4) /* FIXME */
> +# define ENA_PWREN (1 << 3)
> +# define ENA_LEND (1 << 2) /* FIXME */
> +# define BSWP (1 << 1)
> +# define HWSWP (1 << 0)
> +
> +#define LCDSADDR1 0x14
> +# define SET_LCDBANK(x) (((x) & 0x1ff) << 21)
> +# define GET_LCDBANK(x) (((x) >> 21) & 0x1ff)
> +# define SET_LCDBASEU(x) ((x) & 0x1fffff)
> +# define GET_LCDBASEU(x) ((x) & 0x1fffff)
> +
> +#define LCDSADDR2 0x18
> +# define SET_LCDBASEL(x) ((x) & 0x1fffff)
> +# define GET_LCDBASEL(x) ((x) & 0x1fffff)
> +
> +#define LCDSADDR3 0x1c
> +# define SET_OFFSIZE(x) (((x) & 0x7ff) << 11)
> +# define GET_OFFSIZE(x) (((x) >> 11) & 0x7ff)
> +# define SET_PAGE_WIDTH(x) ((x) & 0x3ff)
> +# define GET_PAGE_WIDTH(x) ((x) & 0x3ff)
> +
> +#define RED_LUT 0x20
> +#define GREEN_LUT 0x24
> +#define BLUE_LUT 0x28
> +
> +#define DITHMODE 0x4c
> +
> +#define TPAL 0x50
> +
> +#define LCDINTPND 0x54
> +
> +#define LCDSRCPND 0x58
> +
> +#define LCDINTMSK 0x5c
> +# define FIWSEL (1 << 2)
> +
> +#define TCONSEL 0x60
> +
> +#define RED 0
> +#define GREEN 1
> +#define BLUE 2
> +#define TRANSP 3
> +
> +struct s3cfb_host {
> + struct fb_host fb_data;
> + struct device_d *hw_dev;
> + void __iomem *base;
> +};
> +
> +#define fb_info_to_s3cfb_host(x) ((struct s3cfb_host*)((x)->host))
> +#define s3cfb_host_to_s3c_fb_platform_data(x) ((struct s3c_fb_platform_data*)((x)->hw_dev->platform_data))
Please add a pointer to 3c_fb_platform_data to s3cfb_host and get rid of
this define.
> +
> +/* the RGB565 true colour mode */
> +static const struct fb_bitfield def_rgb565[] = {
> + [RED] = {
> + .offset = 11,
> + .length = 5,
> + },
> + [GREEN] = {
> + .offset = 5,
> + .length = 6,
> + },
> + [BLUE] = {
> + .offset = 0,
> + .length = 5,
> + },
> + [TRANSP] = { /* no support for transparency */
> + .length = 0,
> + }
> +};
> +
> +/* the RGB888 true colour mode */
> +static const struct fb_bitfield def_rgb888[] = {
> + [RED] = {
> + .offset = 16,
> + .length = 8,
> + },
> + [GREEN] = {
> + .offset = 8,
> + .length = 8,
> + },
> + [BLUE] = {
> + .offset = 0,
> + .length = 8,
> + },
> + [TRANSP] = { /* no support for transparency */
> + .length = 0,
> + }
> +};
> +
> +/**
> + * @param fb_info Framebuffer information
> + */
> +static void s3cfb_enable_controller(struct fb_info *fb_info)
> +{
> + struct s3cfb_host *fbh = fb_info_to_s3cfb_host(fb_info);
> + struct s3c_fb_platform_data *pdata = s3cfb_host_to_s3c_fb_platform_data(fbh);
> + uint32_t con1;
> +
> + pr_debug("%s called\n", __func__);
> +
> + con1 = readl(fbh->base + LCDCON1);
> +
> + con1 |= ENVID;
> +
> + writel(con1, fbh->base + LCDCON1);
> +
> + if (pdata->enable)
> + (pdata->enable)(1);
> +}
> +
> +/**
> + * @param fb_info Framebuffer information
> + */
> +static void s3cfb_disable_controller(struct fb_info *fb_info)
> +{
> + struct s3cfb_host *fbh = fb_info_to_s3cfb_host(fb_info);
> + struct s3c_fb_platform_data *pdata = s3cfb_host_to_s3c_fb_platform_data(fbh);
> + uint32_t con1;
> +
> + pr_debug("%s called\n", __func__);
> +
> + if (pdata->enable)
> + (pdata->enable)(0);
> +
> + con1 = readl(fbh->base + LCDCON1);
> +
> + con1 &= ~ENVID;
> +
> + writel(con1, fbh->base + LCDCON1);
> +}
> +
> +/**
> + * Prepare the video hardware for a specified video mode
> + * @param fb_info Framebuffer information
> + * @param mode The video mode description to initialize
> + * @return 0 on success
> + */
> +static int s3cfb_initialize_mode(struct fb_info *fb_info, const struct fb_videomode *mode)
> +{
> + struct s3cfb_host *fbh = fb_info_to_s3cfb_host(fb_info);
> + struct s3c_fb_platform_data *pdata = s3cfb_host_to_s3c_fb_platform_data(fbh);
> + unsigned size, hclk, div;
> + uint32_t con1, con2, con3, con4, con5 = 0;
> +
> + pr_debug("%s called\n", __func__);
> +
> + if (pdata->passive_display != 0) {
> + pr_err("Passive displays are currently not supported\n");
> + return -EINVAL;
> + }
> +
> + /*
> + * we need at least this amount of memory for the framebuffer
> + */
> + size = mode->xres * mode->yres * (fb_info->bits_per_pixel >> 3);
> + if (fb_info->fb_dev->size != 0) {
> + if (size > fb_info->fb_dev->size) {
> + pr_err("Cannot initialize video mode '%s': Its too large. "
> + "Required bytes are %u, available only %u\n",
> + mode->name, size, fb_info->fb_dev->size);
> + return -EINVAL;
> + }
> + } else
> + fb_info->fb_dev->size = size;
> +
> + /*
> + * if no framebuffer memory was specified yet, allocate one,
> + * and allocate more memory, on user request
> + */
> + if (fb_info->fb_dev->map_base == 0U)
> + fb_info->fb_dev->map_base = (resource_size_t)xzalloc(fb_info->fb_dev->size);
Honestly I don't understand what the two blocks above do. I hope this
gets simpler once we remove the base/size arguments from
register_framebuffer.
> +
> + /* its useful to enable the unit's clock */
> + s3c244x_mod_clock(CLK_LCDC, 1);
> +
> + /* ensure video output is _off_ */
> + writel(0x00000000, fbh->base + LCDCON1);
> +
> + hclk = s3c24xx_get_hclk() / 1000U; /* hclk in kHz */
> + div = hclk / PICOS2KHZ(mode->pixclock);
> + if (div < 3)
> + div = 3;
> + /* pixel clock is: (hclk) / ((div + 1) * 2) */
> + div += 1;
> + div >>= 1;
> + div -= 1;
> +
> + con1 = PNRMODE(3) | SET_CLKVAL(div); /* PNRMODE=3 is TFT */
> +
> + switch (fb_info->bits_per_pixel) {
> +#if 0
> + /* TODO add CLUT based modes */
> + case 1:
> + con1 |= BPPMODE(8);
> + break;
> + case 2:
> + con1 |= BPPMODE(9);
> + break;
> + case 4:
> + con1 |= BPPMODE(10);
> + break;
> + case 8:
> + con1 |= BPPMODE(11);
> + break;
> +#endif
> + case 16:
> + con1 |= BPPMODE(12);
> + con5 |= FRM565;
> + fb_info->red = def_rgb565[RED];
> + fb_info->green = def_rgb565[GREEN];
> + fb_info->blue = def_rgb565[BLUE];
> + fb_info->transp = def_rgb565[TRANSP];
> + break;
> + case 24:
> + con1 |= BPPMODE(13);
> + con5 |= BPP24BL; /* FIXME */
Please either remove the FIXME or explain what we have to fix here.
> + fb_info->red = def_rgb888[RED];
> + fb_info->green = def_rgb888[GREEN];
> + fb_info->blue = def_rgb888[BLUE];
> + fb_info->transp = def_rgb888[TRANSP];
> + break;
> + default:
> + pr_err("Invalid bits per pixel value: %u\n", fb_info->bits_per_pixel);
> + return -EINVAL;
> + }
> +
> + /* 'normal' in register description means positive logic */
> + if (!(mode->sync & FB_SYNC_HOR_HIGH_ACT))
> + con5 |= INV_HS;
> + if (!(mode->sync & FB_SYNC_VERT_HIGH_ACT))
> + con5 |= INV_VS;
> + if (!(mode->sync & FB_SYNC_DE_HIGH_ACT))
> + con5 |= INV_DE;
> + if (mode->sync & FB_SYNC_CLK_INVERT)
> + con5 |= INV_CLK; /* display should latch at the rising edge */
> + if (mode->sync & FB_SYNC_SWAP_RGB)
> + con5 |= HWSWP;
> +
> + /* TODO power enable config via platform data */
> +
> + /* vertical timing */
> + con2 = SET_VBPD(mode->upper_margin - 1) |
> + SET_LINEVAL(mode->yres - 1) |
> + SET_VFPD(mode->lower_margin - 1) |
> + SET_VSPW(mode->vsync_len - 1);
> +
> + /* horizontal timing */
> + con3 = SET_HBPD(mode->left_margin - 1) |
> + SET_HOZVAL(mode->xres - 1) |
> + SET_HFPD(mode->right_margin - 1);
> + con4 = SET_HSPW(mode->hsync_len - 1);
> +
> + /* basic timing setup */
> + writel(con1, fbh->base + LCDCON1);
> + pr_debug(" Writing %08X into %08X (con1)\n", con1, fbh->base + LCDCON1);
> + writel(con2, fbh->base + LCDCON2);
> + pr_debug(" Writing %08X into %08X (con2)\n", con2, fbh->base + LCDCON2);
> + writel(con3, fbh->base + LCDCON3);
> + pr_debug(" Writing %08X into %08X (con3)\n", con3, fbh->base + LCDCON3);
> + writel(con4, fbh->base + LCDCON4);
> + pr_debug(" Writing %08X into %08X (con4)\n", con4, fbh->base + LCDCON4);
> + writel(con5, fbh->base + LCDCON5);
> + pr_debug(" Writing %08X into %08X (con5)\n", con5, fbh->base + LCDCON5);
> +
> + pr_debug("Setting up the fb baseadress to %08X\n", fb_info->fb_dev->map_base);
> +
> + /* framebuffer memory setup */
> + writel(fb_info->fb_dev->map_base >> 1, fbh->base + LCDSADDR1);
> + size = mode->xres * (fb_info->bits_per_pixel >> 3) * (mode->yres);
You already calculated this value.
> + writel(SET_LCDBASEL((fb_info->fb_dev->map_base + size) >> 1), fbh->base + LCDSADDR2);
> +
> + writel(SET_OFFSIZE(0) |
> + SET_PAGE_WIDTH((mode->xres * fb_info->bits_per_pixel) >> 4),
> + fbh->base + LCDSADDR3);
> +
> + writel(FIWSEL, fbh->base + LCDINTMSK);
> +
> + return 0;
> +}
> +
> +/**
> + * Print some information about the current hardware state
> + * @param hw_dev S3C video device
> + */
> +#ifdef CONFIG_VIDEO_INFO_VERBOSE
> +static void s3cfb_info(struct device_d *hw_dev)
> +{
> + uint32_t con1, addr1, addr2, addr3;
> +
> + con1 = readl(hw_dev->map_base + LCDCON1);
> + addr1 = readl(hw_dev->map_base + LCDSADDR1);
> + addr2 = readl(hw_dev->map_base + LCDSADDR2);
> + addr3 = readl(hw_dev->map_base + LCDSADDR3);
> +
> + printf(" Video hardware info:\n");
> + printf(" Video clock is running at %u Hz\n", s3c24xx_get_hclk() / ((GET_CLKVAL(con1) + 1) * 2));
> + printf(" Video memory bank starts at 0x%08X\n", GET_LCDBANK(addr1) << 22);
> + printf(" Video memory bank offset: 0x%08X\n", GET_LCDBASEU(addr1));
> + printf(" Video memory end: 0x%08X\n", GET_LCDBASEU(addr2));
> + printf(" Virtual screen offset size: %u half words\n", GET_OFFSIZE(addr3));
> + printf(" Virtual screen page width: %u half words\n", GET_PAGE_WIDTH(addr3));
> +}
> +#endif
> +
> +/*
> + * There is only one video hardware instance available.
> + * It makes no sense to dynamically allocate this data
> + */
> +static struct s3cfb_host host_data = {
> + .fb_data.fb_mode = s3cfb_initialize_mode,
> + .fb_data.fb_enable = s3cfb_enable_controller,
> + .fb_data.fb_disable = s3cfb_disable_controller,
> +};
> +
> +static int s3cfb_probe(struct device_d *hw_dev)
> +{
> + struct s3c_fb_platform_data *pdata = hw_dev->platform_data;
> + struct device_d *fb_dev;
> +
> + pr_debug("%s called\n", __func__);
> +
> + if (pdata == NULL) {
> + pr_debug("Framebuffer driver missing platform data");
> + return -ENODEV;
> + }
> +
> + /* enable unit's clock */
> + s3c244x_mod_clock(CLK_LCDC, 1);
> +
> + writel(0, hw_dev->map_base + LCDCON1);
> + /* off may be means high level (FIXME itlp specific) */
> + writel(0, hw_dev->map_base + LCDCON5);
> +
> + /* disable it again until user request */
> + s3c244x_mod_clock(CLK_LCDC, 0);
> +
> + /* add runtime hardware info */
> + host_data.hw_dev = hw_dev;
> + host_data.base = (void*)hw_dev->map_base;
> +
> + /* add runtime video info */
> + host_data.fb_data.mode = pdata->mode_list;
> + host_data.fb_data.mode_cnt = pdata->mode_cnt;
> +
> + fb_dev = register_framebuffer(&host_data.fb_data, pdata->framebuffer, pdata->size);
> + if (fb_dev == NULL) {
> + pr_err("Failed to register framebuffer\n");
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static struct driver_d s3cfb_driver = {
> + .name = "s3cfb",
> + .probe = s3cfb_probe,
> +#ifdef CONFIG_VIDEO_INFO_VERBOSE
> + .info = s3cfb_info,
> +#endif
> +};
> +
> +static int s3cfb_init(void)
> +{
> + return register_driver(&s3cfb_driver);
> +}
> +
> +device_initcall(s3cfb_init);
> +
> +/**
> + * The S3C244x LCD controller supports passive (CSTN/STN) and active (TFT) LC displays
> + *
> + * The driver itself currently supports only active TFT LC displays in the follwing manner:
> + *
> + * * Palletized colours
> + * - 1 bpp
> + * - 2 bpp
> + * - 4 bpp
> + * - 8 bpp
> + * * True colours
> + * - 16 bpp
> + * - 24 bpp
> + */
> --
> 1.7.2.3
>
>
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next prev parent reply other threads:[~2010-11-01 14:41 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-26 11:31 [PATCHv2] Add dynamic video initialization to barebox Juergen Beisert
2010-10-26 11:31 ` [PATCH 01/12] Separate framebuffer platformdata and the videomode Juergen Beisert
2010-10-26 11:31 ` [PATCH 02/12] Add more flags for sync control Juergen Beisert
2010-10-26 11:31 ` [PATCH 03/12] Bring in dynamic videomode selection at runtime Juergen Beisert
2010-11-01 13:47 ` Sascha Hauer
2010-11-15 10:04 ` Juergen Beisert
2010-11-17 8:27 ` Sascha Hauer
2010-11-01 14:16 ` Sascha Hauer
2010-11-15 10:08 ` Juergen Beisert
2010-10-26 11:31 ` [PATCH 04/12] Remove the old videomode functions Juergen Beisert
2010-10-26 11:31 ` [PATCH 05/12] Add verbose framebuffer device info Juergen Beisert
2010-10-26 11:31 ` [PATCH 06/12] Adapt the existing imx fb driver to support runtime videomode selection Juergen Beisert
2010-10-26 11:31 ` [PATCH 07/12] Adapt the existing imx-ipu " Juergen Beisert
2010-10-26 11:31 ` [PATCH 08/12] Add a video driver for S3C2440 bases platforms Juergen Beisert
2010-11-01 14:41 ` Sascha Hauer [this message]
2010-11-15 11:35 ` Juergen Beisert
2010-11-17 8:36 ` Sascha Hauer
2010-10-26 11:31 ` [PATCH 09/12] STM378x: Add video driver for this platform Juergen Beisert
2010-10-26 11:31 ` [PATCH 10/12] Remove variable size restrictions Juergen Beisert
2010-10-26 11:31 ` [PATCH 11/12] Add doxygen documentation to the framebfuffer code Juergen Beisert
2010-10-26 11:31 ` [PATCH 12/12] Provide more driver specific data in a videomode Juergen Beisert
2010-11-01 13:19 ` [PATCHv2] Add dynamic video initialization to barebox Sascha Hauer
2010-11-01 13:29 ` Eric Bénard
2010-11-01 14:18 ` Sascha Hauer
2010-11-15 9:57 ` Juergen Beisert
2010-11-15 10:25 ` Belisko Marek
2010-11-17 8:44 ` Sascha Hauer
2010-11-18 8:18 ` Belisko Marek
2010-11-18 10:09 ` Sascha Hauer
2010-11-17 8:43 ` Sascha Hauer
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